Cleanup <include/> and etc. in keyboard XML

* Remove keyXPos and keyWidth from key_*.xml and make it more generic.
* Add keyXPos and keyWidth to <include/> generalized key_*.xml.
* Remove zero width <Spacer/> and fold into successive <include/>.

Change-Id: I4b5c02a165ba0bc9ef8741be0b4938c1efaf5e27
diff --git a/java/res/xml-sw768dp/rows_colemak.xml b/java/res/xml-sw768dp/rows_colemak.xml
index e004480..01ebead 100644
--- a/java/res/xml-sw768dp/rows_colemak.xml
+++ b/java/res/xml-sw768dp/rows_colemak.xml
@@ -34,7 +34,7 @@
             latin:keyboardLayout="@xml/rowkeys_colemak1"
             latin:keyLabelFlags="disableAdditionalMoreKeys|disableKeyHintLabel" />
         <include
-            latin:keyboardLayout="@xml/key_colemak_semicolon" />
+            latin:keyboardLayout="@xml/key_colemak_colon" />
         <Key
             latin:keyStyle="deleteKeyStyle"
             latin:keyWidth="fillBoth" />