Update Font-Awesome to 4.6.1

Created by: Treer

Commit 45654ffc just copies the newer font-awesome files. That commit could be replaced with a git submodule perhaps, but I've no experience with submodules and it's up to the maintainer.

The icons are all upgraded as best as I can tell. I think I got everything, but keep an eye out for missing icons anyway.

Some of the html elements have their icon classes set programmatically, and Font-Awesome 4 needs a new "fa" class added to icon elements, so there's a possibility something could slip through that way (if the html has no indication it's supposed to be an icon, and the code doesn't insert the new "fa" class), but I think they're all working.