Force draw depth to be passed into render calls.
Depth sorting not yet functional.
Entities once again obey DrawDepth.
Explicit drawDepths for everything.
DrawDepths are dynamically assigned based on bridge position.
Draw depths obeyed by the Renderer.
Only ParticleWrapper remains to be tamed.
ParticleWrapper depth sorting enabled.
Split Renderer into logic that convert RenderCalls into objects on the screen, and the scheduler.