Add more builtin extensions

[lambdalisue]

Source

• General
  • [x] File
  • [x] Line
  • [x] List
  • [x] Ripgrep
• Vim
  • [x] buffer
  • [ ] window
  • [ ] tabpage
  • [ ] quickfix
  • [ ] loclist
  • [x] oldfiles
  • [ ] grep
  • [ ] vimgrep
  • [ ] colorscheme
  • [ ] highlight
  • [x] helptag
  • [ ] jumplist
  • [ ] register
  • [ ] mark
  • [ ] command
  • [x] history (command, search)
  • [ ] mapping
• fall
  • [x] extension
• extra (will be removed in beta release)
  • [ ] source from ddu source

Projector

• [x] cwd filter
• [x] exists filter
• [x] substring filter
• [x] lexical sort
• [x] numerical sorter
• [x] date sorter
• [x] fzf matcher
• [x] stat annotator
• [x] bufinfo annotator
• [x] to relative path

Renderer

• [x] Nerdfont (These will be removed from builtin extensions in beta release)
  • [x] nerdfont
  • https://github.com/lambdalisue/vim-fall-renderer-nerdfont
  • [x] devicon
  • https://github.com/lambdalisue/vim-fall-renderer-devicons
  • [x] nvim-web-devicon
  • https://github.com/lambdalisue/vim-fall-renderer-nvim-web-devicons
• [x] smart path
• [ ] smart grep
• [x] extension
• [x] helptag
• [ ] File info (file size, permission, etc.)
• [ ] Buffer info (modified, buffer listed, etc.)

Previewer

• [x] buffer
• [x] file
• [x] attribute
• [x] helptag
• [x] extension
• [ ] shell command

Action

• Vim
  • [x] debug
  • [x] open
  • [x] quickfix
  • [ ] location list
  • [x] cd/lcd/tcd (cmd:cd, cmd:lcd, cmd:tcd)
  • [x] cmd
  • [x] help (cmd:helptag)
  • [ ] function call
  • [x] yank
  • [x] write buffers (modified buffer) (cmd:write)
  • [x] unload/delete/wipe buffers (cmd:bunload, cmd:bdelete, cmd:bwipeout)
• Others
  • [x] system open