runtime(syntax-tests): simplify code and allow filetype options

The whole testdir/runtest.vim is a bit of a mess. So this is an attempt
to improving the current state. First of all, let's move most of the
code into a single RunTest() function so that it's easier to run this
manually.

Then, let's add the possibility to customize filetype specific tests by
applying filetype specific options. We will make use of it in the next
commit, where the provided java file uses tabs, which cause line
wrapping which will then cause the scrolling to miss some lines when
redrawing (see #14105)

related: #14105

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/syntax/testdir/dumps/c_00.dump b/runtime/syntax/testdir/dumps/c_00.dump
index d32cbd2..46c42f1 100644
--- a/runtime/syntax/testdir/dumps/c_00.dump
+++ b/runtime/syntax/testdir/dumps/c_00.dump
@@ -17,4 +17,4 @@
 |#+0#e000e06&| |i|n|c|l|u|d|e| |<+0#e000002&|l|i|m|i|t|s|.|h|>| +0#0000000&@54
 |#+0#e000e06&|e|n|d|i|f| +0#0000000&@68
 @75
-|"|i|n|p|u|t|/|c|.|c|"| |1|2@1|L|,| |3|1|7|4|B| @33|1|,|1| @10|T|o|p| 
+@57|1|,|1| @10|T|o|p| 
diff --git a/runtime/syntax/testdir/dumps/modula2_iso_00.dump b/runtime/syntax/testdir/dumps/modula2_iso_00.dump
index 797376f..0c24cb8 100644
--- a/runtime/syntax/testdir/dumps/modula2_iso_00.dump
+++ b/runtime/syntax/testdir/dumps/modula2_iso_00.dump
@@ -17,4 +17,4 @@
 |(+0#0000e05&|*| |p|r|e|d|e|f|i|n|e|d| |c|o|n|s|t|a|n|t|s| |*|)| +0#0000000&@48
 |F+0#e000002&|A|L|S|E| +0#0000000&|N+0#e000002&|I|L| +0#0000000&|T+0#e000002&|R|U|E| +0#0000000&|I+0#e000002&|N|T|E|R@1|U|P|T|I|B|L|E| +0#0000000&|U+0#e000002&|N|I|N|T|E|R@1|U|P|T|I|B|L|E| +0#0000000&@30
 @75
-|"|i|n|p|u|t|/|m|o|d|u|l|a|2|_|i|s|o|.|d|e|f|"| |1@1|4|L|,| |2|3|1|8|B| @21|1|,|1| @10|T|o|p| 
+@57|1|,|1| @10|T|o|p| 
diff --git a/runtime/syntax/testdir/dumps/modula2_pim_00.dump b/runtime/syntax/testdir/dumps/modula2_pim_00.dump
index 5e85b7a..36aa0de 100644
--- a/runtime/syntax/testdir/dumps/modula2_pim_00.dump
+++ b/runtime/syntax/testdir/dumps/modula2_pim_00.dump
@@ -17,4 +17,4 @@
 |F+0#e000002&|A|L|S|E| +0#0000000&|N+0#e000002&|I|L| +0#0000000&|T+0#e000002&|R|U|E| +0#0000000&@60
 @75
 |(+0#0000e05&|*| |p|r|e|d|e|f|i|n|e|d| |t|y|p|e|s| |*|)| +0#0000000&@52
-|"|i|n|p|u|t|/|m|o|d|u|l|a|2|_|p|i|m|.|d|e|f|"| |1@2|L|,| |2|1|9|7|B| @21|1|,|1| @10|T|o|p| 
+@57|1|,|1| @10|T|o|p| 
diff --git a/runtime/syntax/testdir/dumps/modula2_r10_00.dump b/runtime/syntax/testdir/dumps/modula2_r10_00.dump
index ab4167a..a2e475e 100644
--- a/runtime/syntax/testdir/dumps/modula2_r10_00.dump
+++ b/runtime/syntax/testdir/dumps/modula2_r10_00.dump
@@ -17,4 +17,4 @@
 |N+0#e000002&|I|L| +0#0000000&|F+0#e000002&|A|L|S|E| +0#0000000&|T+0#e000002&|R|U|E| +0#0000000&@60
 @75
 |(+0#0000e05&|*| |p|r|e|d|e|f|i|n|e|d| |t|y|p|e|s| |*|)| +0#0000000&@52
-|"|i|n|p|u|t|/|m|o|d|u|l|a|2|_|r|1|0|.|d|e|f|"| |1|4|6|L|,| |2|9|8|3|B| @21|1|,|1| @10|T|o|p| 
+@57|1|,|1| @10|T|o|p| 
diff --git a/runtime/syntax/testdir/dumps/vim_ex_abbreviate_00.dump b/runtime/syntax/testdir/dumps/vim_ex_abbreviate_00.dump
index 68055d8..5224a4f 100644
--- a/runtime/syntax/testdir/dumps/vim_ex_abbreviate_00.dump
+++ b/runtime/syntax/testdir/dumps/vim_ex_abbreviate_00.dump
@@ -17,4 +17,4 @@
 |i+0#af5f00255&|a|b@1|r|e|v| +0#0000000&|<+0#e000e06&|e|x|p|r|>| +0#0000000&|<+0#e000e06&|b|u|f@1|e|r|>| +0#0000000&|i|f|o@1| |c|f|o@1|b|a|r| @38
 @75
 |u+0#af5f00255&|n|a|b@1|r|e|v| +0#0000000&|<+0#e000e06&|b|u|f@1|e|r|>| +0#0000000&|f|o@1| @53
-|"|i|n|p|u|t|/|v|i|m|_|e|x|_|a|b@1|r|e|v|i|a|t|e|.|v|i|m|"| |2|5|L|,| |5@1|8|B| @17|1|,|1| @10|T|o|p| 
+@57|1|,|1| @10|T|o|p| 
diff --git a/runtime/syntax/testdir/dumps/vim_ex_behave_00.dump b/runtime/syntax/testdir/dumps/vim_ex_behave_00.dump
index cd88b75..b3c57de 100644
--- a/runtime/syntax/testdir/dumps/vim_ex_behave_00.dump
+++ b/runtime/syntax/testdir/dumps/vim_ex_behave_00.dump
@@ -17,4 +17,4 @@
 |~| @73
 |~| @73
 |~| @73
-|"+0#0000000&|i|n|p|u|t|/|v|i|m|_|e|x|_|b|e|h|a|v|e|.|v|i|m|"| |7|L|,| |7@1|B| @23|1|,|1| @10|A|l@1| 
+| +0#0000000&@56|1|,|1| @10|A|l@1| 
diff --git a/runtime/syntax/testdir/dumps/vim_ex_behave_99.dump b/runtime/syntax/testdir/dumps/vim_ex_behave_99.dump
index a0a0e18..c3fefeb 100644
--- a/runtime/syntax/testdir/dumps/vim_ex_behave_99.dump
+++ b/runtime/syntax/testdir/dumps/vim_ex_behave_99.dump
@@ -17,4 +17,4 @@
 |~| @73
 |~| @73
 |~| @73
-|"+0#0000000&|i|n|p|u|t|/|v|i|m|_|e|x|_|b|e|h|a|v|e|.|v|i|m|"| |7|L|,| |7@1|B| @23|7|,|1| @10|A|l@1| 
+| +0#0000000&@56|7|,|1| @10|A|l@1| 
diff --git a/runtime/syntax/testdir/dumps/vim_ex_commands_00.dump b/runtime/syntax/testdir/dumps/vim_ex_commands_00.dump
index f3e48c0..863ae38 100644
--- a/runtime/syntax/testdir/dumps/vim_ex_commands_00.dump
+++ b/runtime/syntax/testdir/dumps/vim_ex_commands_00.dump
@@ -17,4 +17,4 @@
 |:|3+0#af5f00255&|m|a|t|c|h| +0#0000000&@67
 |:+0#af5f00255&|a|p@1|e|n|d| +0#0000000&@67
 | +0#e000002&@3|t|e|x|t| +0#0000000&@66
-|"|i|n|p|u|t|/|v|i|m|_|e|x|_|c|o|m@1|a|n|d|s|.|v|i|m|"| |1@1|9|5|L|,| |1|7|3|0|1|B| @15|1|,|1| @10|T|o|p| 
+@57|1|,|1| @10|T|o|p| 
diff --git a/runtime/syntax/testdir/dumps/vim_ex_echo_00.dump b/runtime/syntax/testdir/dumps/vim_ex_echo_00.dump
index 506c9e2..a626c7b 100644
--- a/runtime/syntax/testdir/dumps/vim_ex_echo_00.dump
+++ b/runtime/syntax/testdir/dumps/vim_ex_echo_00.dump
@@ -17,4 +17,4 @@
 @75
 |"+0#0000e05&| |:|e|c|h|o| |w|i|t|h|o|u|t| |{|e|x|p|r|}| +0#0000000&@52
 |e+0#af5f00255&|c|h|o||+0#0000000&| |e+0#af5f00255&|c|h|o| +0#0000000&|"+0#e000002&|F|o@1|"| +0#0000000&@58
-|"|i|n|p|u|t|/|v|i|m|_|e|x|_|e|c|h|o|.|v|i|m|"| |2|0|L|,| |3|6|2|B| @23|1|,|1| @10|T|o|p| 
+@57|1|,|1| @10|T|o|p| 
diff --git a/runtime/syntax/testdir/dumps/vim_ex_map_00.dump b/runtime/syntax/testdir/dumps/vim_ex_map_00.dump
index 032eeb4..371c1ce 100644
--- a/runtime/syntax/testdir/dumps/vim_ex_map_00.dump
+++ b/runtime/syntax/testdir/dumps/vim_ex_map_00.dump
@@ -17,4 +17,4 @@
 |o+0#af5f00255&|m|a|p|c|l|e|a|r| +0#0000000&|<+0#e000e06&|b|u|f@1|e|r|>| +0#0000000&@56
 |i+0#af5f00255&|m|a|p|c|l|e|a|r| +0#0000000&|<+0#e000e06&|b|u|f@1|e|r|>| +0#0000000&@56
 |l+0#af5f00255&|m|a|p|c|l|e|a|r| +0#0000000&|<+0#e000e06&|b|u|f@1|e|r|>| +0#0000000&@56
-|"|i|n|p|u|t|/|v|i|m|_|e|x|_|m|a|p|.|v|i|m|"| |2|1|L|,| |3|1|6|B| @24|1|,|1| @10|T|o|p| 
+@57|1|,|1| @10|T|o|p| 
diff --git a/runtime/syntax/testdir/dumps/vim_ex_substitute_00.dump b/runtime/syntax/testdir/dumps/vim_ex_substitute_00.dump
index 31094c9..aea97ed 100644
--- a/runtime/syntax/testdir/dumps/vim_ex_substitute_00.dump
+++ b/runtime/syntax/testdir/dumps/vim_ex_substitute_00.dump
@@ -17,4 +17,4 @@
 |:|s+0#af5f00255&|m|a|g|i|c|/+0#e000e06&|f+0#0000000&|o@1|/+0#e000e06&|b+0#0000000&|a|r|/+0#e000e06&|c|e|g|i|I|n|p|#|l|r| +0#0000000&@48
 @75
 |c+0#af5f00255&|a|l@1| +0#0000000&|F|o@1|(+0#e000e06&|)| +0#0000000&||| |s+0#af5f00255&|u|b|s|t|i|t|u|t|e|/+0#e000e06&|f+0#0000000&|o@1|/+0#e000e06&|b+0#0000000&|a|r|/+0#e000e06&|&| +0#0000000&@41
-|"|i|n|p|u|t|/|v|i|m|_|e|x|_|s|u|b|s|t|i|t|u|t|e|.|v|i|m|"| |8|6|L|,| |1|5|1|0|B| @16|1|,|1| @10|T|o|p| 
+@57|1|,|1| @10|T|o|p| 
diff --git a/runtime/syntax/testdir/dumps/vim_expr_00.dump b/runtime/syntax/testdir/dumps/vim_expr_00.dump
index dd1cfa7..899b73c 100644
--- a/runtime/syntax/testdir/dumps/vim_expr_00.dump
+++ b/runtime/syntax/testdir/dumps/vim_expr_00.dump
@@ -17,4 +17,4 @@
 |e+0#af5f00255&|c|h|o| +0#0000000&|$+0#e000002&|'|\|3|1|6| |\|3|1| |\|3| |\|x|1|f| |\|x|f| |\|X|1|F| |\|X|F| |\|u|0|2|a|4| |\|U|0@4|2|a|4| |\|b| |\|e| |\|f| |\|n| |\|r| |\|t| |\@1
 | |\|"| |\|<|C|-|W|>|'| +0#0000000&@63
 |e+0#af5f00255&|c|h|o| +0#0000000&|$+0#e000002&|"|\+0#e000e06&|3|1|6|0+0#e000002&| |-| |\+0#e000e06&|x|1|f|0+0#e000002&| |-| |\+0#e000e06&|X|1|F|0+0#e000002&| |-| |\+0#e000e06&|u|0|2|a|4|0+0#e000002&| |-| |\+0#e000e06&|U|0@4|2|a|4|0+0#e000002&|"| +0#0000000&@21
-|"|i|n|p|u|t|/|v|i|m|_|e|x|p|r|.|v|i|m|"| |3|1|L|,| |1@1|6|2|B| @25|1|,|1| @10|T|o|p| 
+@57|1|,|1| @10|T|o|p| 
diff --git a/runtime/syntax/testdir/dumps/vim_key_notation_00.dump b/runtime/syntax/testdir/dumps/vim_key_notation_00.dump
index 8b77cf3..ed58e2f 100644
--- a/runtime/syntax/testdir/dumps/vim_key_notation_00.dump
+++ b/runtime/syntax/testdir/dumps/vim_key_notation_00.dump
@@ -17,4 +17,4 @@
 |<+0#e000e06&|x|C|S|I|>| +0#0000000&@68
 |<+0#e000e06&|B|a|r|>| +0#0000000&@69
 |<+0#e000e06&|B|s|l|a|s|h|>| +0#0000000&@66
-|"|i|n|p|u|t|/|v|i|m|_|k|e|y|_|n|o|t|a|t|i|o|n|.|v|i|m|"| |1|6|3|L|,| |1|3|4|6|B| @16|1|,|1| @10|T|o|p| 
+@57|1|,|1| @10|T|o|p| 
diff --git a/runtime/syntax/testdir/dumps/vim_keymap_00.dump b/runtime/syntax/testdir/dumps/vim_keymap_00.dump
index 974c5ad..2c43e3d 100644
--- a/runtime/syntax/testdir/dumps/vim_keymap_00.dump
+++ b/runtime/syntax/testdir/dumps/vim_keymap_00.dump
@@ -17,4 +17,4 @@
 |s+0#af5f00255&|c|r|i|p|t|e|n|c|o|d|i|n|g| +0#0000000&|u|t|f|-+0#af5f00255&|8+0#e000002&| +0#0000000&@54
 @75
 |@+0#4040ff13&@2| @71
-|"+0#0000000&|i|n|p|u|t|/|v|i|m|_|k|e|y|m|a|p|.|v|i|m|"| |2|6|L|,| |3|9@1|2|B| @23|1|,|1| @10|T|o|p| 
+| +0#0000000&@56|1|,|1| @10|T|o|p| 
diff --git a/runtime/syntax/testdir/dumps/vim_line_continuation_00.dump b/runtime/syntax/testdir/dumps/vim_line_continuation_00.dump
index 7733c0b..3bc4eba 100644
--- a/runtime/syntax/testdir/dumps/vim_line_continuation_00.dump
+++ b/runtime/syntax/testdir/dumps/vim_line_continuation_00.dump
@@ -17,4 +17,4 @@
 @8|\+0#e000e06&| +0#0000000&|b+0#af5f00255&| +0#0000000&|=+0#af5f00255&| +0#0000000&|{+0#e000e06&|a+0#00e0e07&|:|b|}+0#e000e06&|,+0#0000000&| @54
 | +0#0000e05&@7|"|\| |p|r|i|n|t| |c| +0#0000000&@56
 @8|\+0#e000e06&| +0#0000000&|c+0#af5f00255&| +0#0000000&|=+0#af5f00255&| +0#0000000&|{+0#e000e06&|a+0#00e0e07&|:|c|}+0#e000e06&| +0#0000000&@55
-|"|i|n|p|u|t|/|v|i|m|_|l|i|n|e|_|c|o|n|t|i|n|u|a|t|i|o|n|.|v|i|m|"| |4|9|L|,| |6|2|6|B| @13|1|,|1| @10|T|o|p| 
+@57|1|,|1| @10|T|o|p| 
diff --git a/runtime/syntax/testdir/dumps/vim_new_00.dump b/runtime/syntax/testdir/dumps/vim_new_00.dump
index 6306fae..2ff76f4 100644
--- a/runtime/syntax/testdir/dumps/vim_new_00.dump
+++ b/runtime/syntax/testdir/dumps/vim_new_00.dump
@@ -17,4 +17,4 @@
 |q+0#af5f00255&|u|i|t| +0#0000000&@70
 |~+0#4040ff13&| @73
 |~| @73
-|"+0#0000000&|i|n|p|u|t|/|v|i|m|_|n|e|w|.|v|i|m|"| |1|7|L|,| |2|0|5|B| @27|1|,|1| @10|A|l@1| 
+| +0#0000000&@56|1|,|1| @10|A|l@1| 
diff --git a/runtime/syntax/testdir/dumps/vim_new_99.dump b/runtime/syntax/testdir/dumps/vim_new_99.dump
index 50a54f2..a9fe50f 100644
--- a/runtime/syntax/testdir/dumps/vim_new_99.dump
+++ b/runtime/syntax/testdir/dumps/vim_new_99.dump
@@ -17,4 +17,4 @@
 >q+0#af5f00255&|u|i|t| +0#0000000&@70
 |~+0#4040ff13&| @73
 |~| @73
-|"+0#0000000&|i|n|p|u|t|/|v|i|m|_|n|e|w|.|v|i|m|"| |1|7|L|,| |2|0|5|B| @27|1|7|,|1| @9|A|l@1| 
+| +0#0000000&@56|1|7|,|1| @9|A|l@1| 
diff --git a/runtime/syntax/testdir/dumps/vim_syntax_00.dump b/runtime/syntax/testdir/dumps/vim_syntax_00.dump
index 21dcc88..916f96d 100644
--- a/runtime/syntax/testdir/dumps/vim_syntax_00.dump
+++ b/runtime/syntax/testdir/dumps/vim_syntax_00.dump
@@ -17,4 +17,4 @@
 @6|"+0#0000e05&|\| |c|o|n|t|a|i|n|e|d| |o|p|t|i|o|n| +0#0000000&@49
 @6|\+0#e000e06&| +0#0000000&|c+0#e000e06&|o|n|t|a|i|n|e|d| +0#0000000&@57
 @6|"+0#0000e05&|\| |c|o|n|t|a|i|n|e|d|i|n| |o|p|t|i|o|n| +0#0000000&@47
-|"|i|n|p|u|t|/|v|i|m|_|s|y|n|t|a|x|.|v|i|m|"| |1|6|4|L|,| |3|7|2|9|B| @22|1|,|1| @10|T|o|p| 
+@57|1|,|1| @10|T|o|p| 
diff --git a/runtime/syntax/testdir/dumps/vim_variables_00.dump b/runtime/syntax/testdir/dumps/vim_variables_00.dump
index 9794113..da77064 100644
--- a/runtime/syntax/testdir/dumps/vim_variables_00.dump
+++ b/runtime/syntax/testdir/dumps/vim_variables_00.dump
@@ -17,4 +17,4 @@
 |l+0#af5f00255&|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|/+0#af5f00255&|=| +0#0000000&|e|x|p|r| @59
 |l+0#af5f00255&|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|%+0#af5f00255&|=| +0#0000000&|e|x|p|r| @59
 |l+0#af5f00255&|e|t| +0#0000000&|f+0#00e0e07&|o@1| +0#0000000&|.+0#af5f00255&|=| +0#0000000&|e|x|p|r| @59
-|"|i|n|p|u|t|/|v|i|m|_|v|a|r|i|a|b|l|e|s|.|v|i|m|"| |1|3|8|L|,| |1|5@1|4|B| @19|1|,|1| @10|T|o|p| 
+@57|1|,|1| @10|T|o|p|