Added basic trait composition.
Added WASD movement of `logo` Texture2D.

actor.TraitsImplementing<T> doesn’t work for
	any interfaces other than ITick.
Seemingly fixed TraitImplementing<T>

Added a second test actor.

Need a better way to store traits instead of
	List<object>
Added a World class which is a big container.

TODO: Move World and Actor to a .Game assembly
	which .Traits will depend on

Removed uses of IMouseSelectable but
	kept implementation.
Pulled actor location from Renderable
	into Positionable.

Added Player type.
Gave actor Player Owner field.

Temporarily, clicking actors kills them.
	ActorID not implemented correctly (at all).