FPS Limit Fix

Improved FPS limiting for Minecraft Beta 1.7.3 running on the Ornithe Toolchain.

Details

Changes the Power Saver limit from 40 to 60 instead, as this is a more common refresh rate.
Ensures the Balanced limit of 120 FPS is actually adhered to, instead of resulting in no limiting.

Additionally, the built-in FPS limiter is replaced with a vastly superior implementation provided by LWJGL.