Split up the massive "run()" method into three slightly more manageable methods: initialize(), onTick(), and run() (that glues it all together)
Continuing cleanup of what used to be Minecraft.run(). Renamed onTick() to onFrame() (to avoid confusion with tick()). Named variables in the timing code. Fixed inconsistent formatting all over.
Substituted all inlined OpenGL constants with named ones. Fixed formatting some more.