Update 1.67: Optimization (pretty large scale)

I took steps to reduce both CPU and GPU requirements for the game.

CPU

When the Update thread drops frames it will reduce how fast the AI updates for the units. They are minor adjustments, but it should give you about 20% more "reach" for your CPU.

GPU

When the Draw thread drops frames the game will start reducing units being drawn. Selected units will always draw, as will military units and cart pushers. However all the rest of the units will start to be left of the scene. This seems to give your CPU about 25% greater "reach". IF you see any bugs (they should be all display bugs if any, as I played for ~10 hours with the new systems and the game still worked great), please let me know. Worst case scenario is (as far as I can tell) will be that a unit wont be displayed that should otherwise be displayed...