Behavior system for servers

This changes have the goal to get the deers working in multiplayer:

*Make the BehavioSystem run on Authority only.
** Reasoning: Locations and a few othere data get already transferred from server to client. Having servers and clients both calculate unit movement, especially in a not deterministic way would be a bad idea.
* Replacte the currently selected animation to the client
** So that the proper animation gets played even if the client is not running a behavior system.