Renderer draws on QImage instead of QBitmap. Thread-safe
Minor fixes to simulator
Scale picture with window size
Added locks for safe zooming. Made the simulator always draw.
Fixed collision detection. Uses get_world_envelope() to determine points of an objects's polygon.
Moved simulator to real/scaled time, added speed control and readout
Merge branch 'qtsimiam' of github.com:whittenjaw85/pysimiam

Conflicts:
	scripts/simulator.py
Merge branch 'physics' of github.com:whittenjaw85/pysimiam

Conflicts:
	scripts/simulator.py
Merge branch 'master' of https://github.com/whittenjaw85/pysimiam into test

Conflicts:
	scripts/simulator.py