This fixes issue #1504

Something similar would have to be done in Projector.

Also while at it I found particles sorting is incorrect: it uses camera info from the previous frame plus _projScreenMatrix gets multiplied more times when there are more particle systems.

This is required for SSAO. Unfortunately scene.overrideMaterial is not enough for proper depth pass. Like for shadow maps, shader animated objects (like morphs) need different depth materials than static objects.

These were coming from the initial setting of weapon, when there was no active animation yet (as behavior didn't get yet to select the animation state).

Modified MD2CharacterComplex to allow for sharing of geometries and textures. Added API for toggling shadows and visibility.