hintstring, some new commands

Added hintstring prototype; use :hints, :ars, or M-x colemak-evil-hints to access.

Added:
:git = M-x magit-status
:c = :comment = M-x comment-or-uncomment-region
:eval = C-:
:key = :describe-key = C-h k
:fun = :describe-function = C-h f