git: Add local support dir to ignored files
vim: Activate abolish plugin for coercions

Switch between snake, camel case and such.
vim: Force close all windows on ,qQ
vim: Prevent errors on vimrc reloading
vim: Switch to standard window navigation

It uses more keystrokes but it is more portable and also it doesn't
clash with other pane navigation stuff (iTerm/tmux).
tmux: Add pane creation and navigation shortcuts

- pane creation uses vim like shortcuts
- pane navigation also uses hjkl but with tmux's prefix to avoid
  shortcut clashes
vim: Let ctrlp open newly created files in new tab