perf game loop and systems

[luetkemj]

Now that everything runs twice FPS is starting to dip.

Render for monsters can be a lot lighter. Should only have to check for monsters/items in fov and give them the same light of the tile they are on. Should only have to do any real recalc if they are also a lightsource or do crazy stuff down the line like blow shit up. But that's a ways off.