runtime(vim): Update base syntax, improve :match highlighting

- Match the range prefix separately as a count.
- Match an explicit count of 1, rarely used but seen in the wild.
- Allow whitespace between the count and command.

closes: #17717

Signed-off-by: Doug Kearns <dougkearns@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/syntax/testdir/dumps/vim_ex_commands_66.dump

@@ -1,13 +1,9 @@
-|"+0#0000e05#ffffff0| |V|i|m|9|-|s|c|r|i|p|t| |o|n|l|y| +0#0000000&@56
-@75
-|:|a|b|s|t|r|a|c|t| @65
-|:|c|l|a|s@1| @68
-|:|e|n|d|c|l|a|s@1| @65
->:|e|n|d|i|n|t|e|r|f|a|c|e| @61
+|:+0&#ffffff0|e|n|d|c|l|a|s@1| @65
+|:|e|n|d|i|n|t|e|r|f|a|c|e| @61
 |:|e|n|d|e|n|u|m| @66
 |:|e|n|u|m| @69
 |:|e|x|p|o|r|t| @67
-|:|f+0#af5f00255&|i|n|a|l| +0#0000000&@68
+>:|f+0#af5f00255&|i|n|a|l| +0#0000000&@68
 |:|i|n|t|e|r|f|a|c|e| @64
 |:|p|u|b|l|i|c| @67
 |:|s|t|a|t|i|c| @67
@@ -17,4 +13,8 @@
 |F|o@1|(+0#e000e06&|)| +0#0000000&||| |a|b|s|t|r|a|c|t| @58
 |F|o@1|(+0#e000e06&|)| +0#0000000&||| |c|l|a|s@1| @61
 |F|o@1|(+0#e000e06&|)| +0#0000000&||| |e|n|d|c|l|a|s@1| @58
+|F|o@1|(+0#e000e06&|)| +0#0000000&||| |e|n|d|e|n|u|m| @59
+|F|o@1|(+0#e000e06&|)| +0#0000000&||| |e|n|d|i|n|t|e|r|f|a|c|e| @54
+|F|o@1|(+0#e000e06&|)| +0#0000000&||| |e|n|u|m| @62
+|F|o@1|(+0#e000e06&|)| +0#0000000&||| |e|x|p|o|r|t| @60
 @57|1@1|8|9|,|1| @7|9@1|%|