[vim] Huge rework!

I want to thank n2o4 for letting me base my configs of his. It is easy
to be tall when you stand on the shoulders of giants.

- Clean out a lot of hidden files from colors.
- Move keybindings out of vimrc and into plugins/keybinds.vim .
- New colorscheme: hybrid.
- Reformat vimrc.
- Ag command added.
- Added new plugins.
- Added new ftplugin files.
- Added a few macros for convenience when working with C files.