Forgot to commit this like three months ago:
 * Made the file/folder selector worke.
 * Note: CEGUI is a bit unresponsive. Try to fix this.
 * Note: The file/folder selector needs a lot of work to be usable. Also
it's hard to use it because of the aforementioned unresponsive CEGUI.
It's annoying clicking on something and then having to click on it again
for your click to be registered or whatever's going on.
 * Also, don't forget to finish writing all this new code. I mean, the
file/folder selector's there and all, but the interface doesn't actually
use the thing the user selects. The callback will probably need to be
modified to account for this so that the interface can process the
result and make useful things come from this code. Yay!