[Vim] Replace netrw.vim/vinegar.vim with FileBeagle

Provides all the features I need and seems to be much less buggy.
[Vim] Uninstall vim-texobj-line

Doesn't work with surround.vim and conflicts with targets.vim anyway.
[Vim] Conceal Markdown checkboxes

Turns on 'conceal' and displays Markdown-style checkboxes as fancy
Unicode characters.

Turning on 'conceal' also conceals some other things like bold/italic
markers.
[Vim] Change paths to dot-files

Probably should not hard-code it, but not too big a deal.
[Vim] Update utility functions

- Rename helper -> util
- Move filetype helpers to top level
- Update PHP helpers with function text objects, tests
- Fix broken Cdo functions and command definitions
[Vim] Remove redundant Esc from markdown#OpenLine

Issue caused bell to trigger when using list expansion from normal mode
in ordered lists.
[Vim] Remove old airline.vim theme
[Nano] Remove nanorc

Not sure I'll ever have reason to touch this editor again.
[Vim] Update apache snippets
[Vim] Spelling additions
[Emacs] Fix evil-motion-state cursor color

"Mint" is no longer recognized. "SeaGreen1" will have to do.
[Emacs] Numerous org-mode adjustments