runtime(vim): Update base syntax and generator, improve command/function distinction

- Match Ex command modifiers and functions with the same name correctly.
  E.g., :browse and browse().
- Match full :eval command.

closes: #17789

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

runtime/syntax/testdir/input/vim_function_call.vim

@@ -267,9 +267,11 @@ call g:substitute#substitute()
 " chained function calls
 
 call module.foo().bar()
+call module.foo().substitute()
 
 
 " Issue #17766 (valid function call highlighted as error)
 
 call module[0].foo()
+call module[0].substitute()