- highlight more C keywords, including some from C23

Conditionally highlight C23 features:
- #embed, #elifdef and #elifndef preprocessor directives
- predefined macros
- UTF-8 character constants
- binary integer constants, _BitInt literals, and digit separators
- nullptr_t type and associated constant
- decimal real floating-point, bit precise and char types
- typeof operators

Matchit:
- update for new preprocessor directives

fixes: vim/vim#13667
fixes: vim/vim#13679
closes: vim/vim#12984

https://github.com/vim/vim/commit/c2a967a1b9adca6c929e3dc5c218dfada00059b6

Co-authored-by: Doug Kearns <dougkearns@gmail.com>
Co-authored-by: Albin Ahlbäck <albin.ahlback@gmail.com>

Problem:  no whitespace padding in commentstring option in ftplugins
Solution: Change default to include whitespace padding, update
          existing filetype plugins with the new default value
          (Riley Bruins)

closes: vim/vim#14843

https://github.com/vim/vim/commit/0a0830624a260660c7fa692ecb7e6e5de09114ba

Co-authored-by: Riley Bruins <ribru17@hotmail.com>

runtime(ftplugin): Use "*" browsefilter pattern to match "All Files"

Problem:  The "*.*" browsefilter pattern only matches all files on
	  Windows (Daryl Lee)
Solution: Use "*" to filter on all platforms but keep "*.*" as the label
	  text on Windows. (Fixes vim/vim#12685, Doug Kearns)

The *.* browsefilter pattern used to match "All Files" on Windows is a
legacy of the DOS 8.3 filename wildcard matching algorithm.  For reasons
of backward compatibility this still works on Windows to match all
files, even those without an extension.

However, this pattern only matches filenames containing a dot on other
platforms.  This often makes files without an extension difficult to
access from the file dialog, e.g., "Makefile"

On Windows it is still standard practice to use "*.*" for the filter
label so ftplugins should use "All Files (*.*)" on Windows and "All
Files (*)" on other platforms.  This matches Vim's default browsefilter
values.

This commit also normalises the browsefilter conditional test to check
for the Win32 and GTK GUI features and an unset b:browsefilter.

closes: vim/vim#12759

https://github.com/vim/vim/commit/93197fde0f1db09b1e495cf3eb14a8f42c318b80

Co-authored-by: Doug Kearns <dougkearns@gmail.com>

Farewell to Bram and dedicate upcoming Vim 9.1 to him (vim/vim#12749)

https://github.com/vim/vim/commit/e978b4534a5e10471108259118c0ef791106fd92

Also update the header for the following files that were converted to Vim9
script upstream:

- autoload/ccomplete.lua (vim9jitted)
- ftplugin.vim
- ftplugof.vim
- indent.vim
- indent/vim.vim
- makemenu.vim

This also updates the "Last Change" dates, even if some changes (due to rewrites
to Vim9 script) were not ported.

There's still a few other places where Bram is still mentioned as a maintainer
in the files we and Vim have:

- ftplugin/bash.vim
- indent/bash.vim
- indent/html.vim
- indent/mail.vim
- macros/accents.vim
- macros/editexisting.vim
- syntax/bash.vim
- syntax/shared/typescriptcommon.vim
- syntax/tar.vim
- syntax/typescript.vim
- syntax/typescriptreact.vim
- syntax/zimbu.vim

Maybe future patches will address that.

Also exclude changes to .po files that didn't apply automatically (the
`:messages` maintainer string isn't used in Nvim anyway).

Co-authored-by: Christian Brabandt <cb@256bit.org>

Update runtime files
https://github.com/vim/vim/commit/cbaff5e06ec525d31dc44093125c42029e01d508

omit doc updates here

Update runtime files
https://github.com/vim/vim/commit/34cc7d8c034f2bc5b57455577051db8d72e2b87c

Update runtime files.
https://github.com/vim/vim/commit/560979ed4f0216f902a2c247e937f00a27dcb198

Omit vim9.

Long overdue runtime update.

https://github.com/vim/vim/commit/01164a6546b4c635daf96a1f17d1cb2d07f32a66

Updated runtime files.

https://github.com/vim/vim/commit/c95a302a4c42ec8230473cd4a5e0064d0a143aa8

- fix synopsis highlighting in other locales. Cannot always rely on the first
  line for the section in some locales; instead, use the file path and
  explicitly set b:man_sect to the actual section.
- eliminate separate s:man_args function
- simplify logic: do not reuse buffer content
- introduce b:man_default_sects Fixes #5233
- introduce <Plug>(man_vsplit), <Plug>(man_tab)
- simplify regexps