runtime(vim): Update base-syntax, improve function definition highlighting (#14203)

Improve function definition highlighting.

- Match bang and function modifiers - abort etc.
- Only match valid scope modifiers.
- Match listing commands.
- Don't match ex commands in function names.
- Split function syntax groups into :func and :def subgroups.
- Match Vim9-script parameter and return types.
- Limit legacy-script and Vim9-script comments to :func and :def
  definitions, respectively.

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

1 files changed, 20 insertions, 0 deletions

diff --git a/runtime/syntax/testdir/dumps/vim_ex_function_fold_04.dump b/runtime/syntax/testdir/dumps/vim_ex_function_fold_04.dump
new file mode 100644
index 0000000000..52423a2a26
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/vim_ex_function_fold_04.dump
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