Rearrange gitconfig and add some space
Match up git-related shell aliases to those in gitconfig

Aliases are (relatively) alphabetized and renamed to something more intuitive.

The motivation behind reorganizing the aliases is so that there's more
consistency between using them as shell commands, in gitsh, or when I might feel
like adding a space  after `g` (or not).
I like colors for my git
I tend to get finger-tied when typing commands
Reorganize tmux settings and then some

* Enable mouse mode so that I could select windows and panes that way if I'd
like. This also meant rebinding `y` to copy correctly.
* Group related settings together.
* Rephrased comments to clarify use of settings as well as indicate which ones I
don't understand but should probably keep for now.