Abstract Behavior Manager Code

[MystikalPooka]

The behavior manager is currently responsible for far too much by itself and can not do complicated things without changing multiple things inside of the manager and the editor.

My plan is to abstract all of the behavior running stuff into its own class and use it as a composite managing system. This single system will be included in the manager, which will instead be there just for interacting with the tree runner systems rather than directly running the behaviors and sending events, etc.