- Re-added mp3 support

Big update!
-Made the refresh button bigger and better
-Changed node icons
-Added convar for file limit
-You can now load more files after you've reached the file limit by clicking on the 'add' node
-Added support for ogg's
-Fixed various bugs, updated a few things
-Notice: As of last update, mp3's are no longer supported in GMod, they will NOT show up in this addon

-Sounds played with bindings don't play multiple times per key press anymore.

-Added refresh sound list button
-Added binding system