Remove complete animations that should not loop

[sunjay]

Currently, our animation code relies on an animation component always being present in order to perform its work. This has forced us to keep animation components even for entities that are finished their animation.

Instead, the code in the Animator system should be changed to account for components that do not have an animation just yet. This will also enable us to remove animations using LazyUpdate from any components that do not need the animation anymore.