Problem:  default diff highlighting is too noisy
Solution: Link diff highlighting groups to new
          Added/Removed/Changed, revert previous change
          (Romain Lafourcade)

Remove diff* links added in vim/vim#13776 and doc added in commit b1392be

The links added in vim/vim#13776 are way too noisy for the contexts in which
the `diff` syntax is applied (git commits, patches, etc.).

This commit:

- removes those links
- adds new default highlighting groups Added, Changed and
  Removed
- links the diff highlighting groups to those new defaults
- removes the doc changes
- adjusts the syntax_completion test for those newly added group
  names

Note: Changes to the default color schemes will be handled separately,
by adding links to those newly created Added/Removed/Changed
highlighting groups.

related: vim/vim#13776
closes vim/vim#13825

https://github.com/vim/vim/commit/124371c5a149a8c0c75c04b6c90ac11e71a0aa97

Co-authored-by: Romain Lafourcade <romain.lafourcade@razorfish.fr>

runtime(diff): Update default links (vim/vim#13776)

Problem: Current default links for `diffAdded`, `diffChanged`, and
              `diffRemoved` do not address the diff nature of the filetype.
Solution: Use `DiffAdd`, `DiffChange`, and `DiffDelete`.

closes: vim/vim#13759

https://github.com/vim/vim/commit/00b470052b71ca10d663186d99683e8379b21154

Co-authored-by: Evgeni Chasnovski <evgeni.chasnovski@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/7e6a515ed14e204fafb3dd6e98f2fb543e64aedd

Omit vim9.

Update runtime files.
https://github.com/vim/vim/commit/1b884a0053982335f644eec6c71027706bf3c522

Omit doc/autocmd.txt.
Omit tools/emoji_list.vim. Patch v8.2.1540 is not ported.

Updated runtime files.

https://github.com/vim/vim/commit/939a1abe935a539f2d4c90a56cb0682cbaf3bbb0

Update runtime files.

https://github.com/vim/vim/commit/0122c4070f84e71f15a39fb20ababeffb70757c4

Update runtime files.

https://github.com/vim/vim/commit/8feef4ff6253afb9dcc61c40082ed4fbb96b685c

Update runtime files.

https://code.google.com/p/vim/source/detail?r=c5d53d4c3e2e24e23fc4272bf91be3c031ccb598

Vim runtime files based on 7.4.384 / hg changeset 7090d7f160f7

Excluding:
  Amiga icons (*.info, icons/)
  doc/hangulin.txt
  tutor/
  spell/
  lang/ (only used for menu translations)
  macros/maze/, macros/hanoi/, macros/life/, macros/urm/
      These were used to test vi compatibility.
  termcap
      "Demonstration of a termcap file (for the Amiga and Archimedes)"

Helped-by: Rich Wareham <rjw57@cam.ac.uk>
Helped-by: John <john.schmidt.h@gmail.com>
Helped-by: Yann <yann@yann-salaun.com>
Helped-by: Christophe Badoit <c.badoit@lesiteimmo.com>
Helped-by: drasill <github@tof2k.com>
Helped-by: Tae Sandoval Murgan <taecilla@gmail.com>
Helped-by: Lowe Thiderman <lowe.thiderman@gmail.com>