Problem: 'commentstring' requires the +folding feature but is used in
contexts other than folding.
Solution: Remove the +folding feature guards from 'commentstring' and
make it available in all builds (Doug Kearns).
closes: vim/vim#18731a08030c9f7
Co-authored-by: Doug Kearns <dougkearns@gmail.com>
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)
