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_ex_eval.vim

@@ -0,0 +1,14 @@
+" Vim :eval command
+
+
+eval "Foo"->append(0)
+
+eval "Foo"
+      \ ->append(
+      \ 0
+      \ )
+
+eval "Foo"->append(0) | echo "Foo"
+
+echo "Foo" | eval "Foo"->append(0)
+