chore(pacman): add "caja" GUI file manager
chore(pacman): add "caja" GUI file manager

So that when I do things like "Show in folder" in Chromium it actually
does something useful.

wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent