[Tmux] Split up status bar scripts

...So they can be colored individually.
[Vim] Don't full-screen GUI on launch
[Vim] Spelling additions
[Fish] Add Cask bin/ dir to PATH
[Emacs] Fourth pass of config cleanup

- Finally achieved good consistency across modes with Evil
- Based on profiling, deferring the loading of more packages
- Updated Org from version 7 to 8
- Configure eshell
- Configure other packages (e.g., popwin, move-border, god mode)
- Better documentation overall