Add support for binding to mouse buttons

[robere2]

Mouse buttons 3 and up should support binding to Quickplay keybinds. Mouse button 1 and 2 shouldn't be supported since those are the main buttons used to interact with the Quickplay GUIs

[robere2]

Note, Mouse buttons 4 and up require Patcher to support use in Minecraft.

[yodaluca23]

Yes!! Please add this I was SOO disappointed when I got this mod and realized that wouldn't work!