Animation System should allow Multiple Animations per State

[Barryrowe]

It would be convenient to allow multiple animations to be running for a single state on an entity. Right now to achieve this you have to create multiple enities each with their own AnimationComponent and update all when a state changes.

Unclear if this is a good enhancement yet, or if the current system works better since it forces animations to be tied to their own transform (which makes offsetting them easier, but makes managing all the states harder when they should be in sync).