FPS Limit Fix

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.