Moved connection code from server to sessioncontroller

Added implements runnable to controller super class.
Added Thread management to server.
Added testcode to GameController
Added InputController to client
Added Objective to Game package
Added Timer to game package
Removed ScoreController

core/src/netwerkprog/game/util/Controller.java

@@ -1,5 +1,5 @@
 package netwerkprog.game.util;
 
-public abstract class Controller {
+public abstract class Controller implements Runnable {
 
 }