patch 8.2.0674: some source files are too big

Problem:    Some source files are too big.
Solution:   Move text formatting functions to a new file. (Yegappan
            Lakshmanan, closes #6021)
diff --git a/Filelist b/Filelist
index 7090efc..8c0b260 100644
--- a/Filelist
+++ b/Filelist
@@ -128,6 +128,7 @@
 		src/term.h \
 		src/termlib.c \
 		src/testing.c \
+		src/textformat.c \
 		src/textobject.c \
 		src/textprop.c \
 		src/time.c \
@@ -280,6 +281,7 @@
 		src/proto/terminal.pro \
 		src/proto/termlib.pro \
 		src/proto/testing.pro \
+		src/proto/textformat.pro \
 		src/proto/textobject.pro \
 		src/proto/textprop.pro \
 		src/proto/time.pro \