Problem: Some runtime files no longer spark joy.

Solution: Kondo the place up.

Still sparks _some_ joy (moved to new `runtime/scripts` folder):
* `macros/less.*`
* `mswin.vim`
* `tools/emoji_list.lua`

No longer sparks joy (removed):
* `macmap.vim` (gvimrc file; not useful in Nvim)
* `tools/check_colors.vim` (no longer useful with new default colorscheme and treesitter)
* `macros/editexisting.vim` (throws error on current Nvim)
* `macros/justify.vim` (obsolete shim for `packadd! justify`)
* `macros/matchit.vim` (same)
* `macros/shellmenu.vim` (same)
* `macros/swapmous.vim` (same)

runtime(less): update "Last Change:" header

Commit 103f1dfb7df350650a5d7caadb0364bd79e9d25b forgot to update the
"Last Change:" header. So update it now.

https://github.com/vim/vim/commit/79230f027a25ff12eb7c7b64e1c063297876aae2

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

runtime(less): reset readonly setting when disabling less mode

While at it, also do the unmap only if a specific key has been mapped.
There are some keys that are only selectively mapped and it would cause
an error if we are trying to unmap such a key (e.g. z when your
foldmethod is not manual).

fixes: vim/vim#14040

https://github.com/vim/vim/commit/103f1dfb7df350650a5d7caadb0364bd79e9d25b

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

runtime: Remove Brams name from a few more runtime files (vim/vim#12780)

syntax/model.vim: minor wording improvement

https://github.com/vim/vim/commit/e8d6f03f6a61f60de6893253621d057f63dd6a23

Use the updated "Last Change" date for all.

Co-authored-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Adri Verhoef <a3@a3.xs4all.nl>

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/4072ba571babd733d1800c082416fe8fe3c28ed7

Omit vim9 references.
Omit assert_fails(). Patch v8.2.1183 is not ported yet.

Update runtime files
https://github.com/vim/vim/commit/388a5d4f20b4b64341d1604aa238cab85827b892

Omit vim9.

Update runtime files.

https://github.com/vim/vim/commit/cd5c8f82507822467232ab71e1ebbaae19595916

Problem:    The justify plugin has to be copied or sourced to be used.
Solution:   Turn it into a package.

https://github.com/vim/vim/commit/2946d0236dc9e23ec0050feacdb959b9ae5672a8

Justification for changes that do not carry over

- `Filelist` does not exist in neovim
- neovim does not have a `README.txt` in `runtime/macros`

Problem:    The shellmenu plugin has to be copied or sourced to be used.
Solution:   Turn it into a package.

https://github.com/vim/vim/commit/fead3ac9a35e0fc358141d3eb19574cd8a3ecb55

Justification for changes that do not carry over

- `Filelist` does not exist in neovim
- neovim does not have a `README.txt` in `runtime/macros`