Updated 'PieceState' enumeration.

Updated the 'PieceState' enumeration by removing unused methods from it.

Projekte/mdga/model/src/main/java/pp/mdga/game/PieceState.java

@@ -1,7 +1,5 @@
 package pp.mdga.game;
 
-import com.jme3.network.serializing.Serializable;
-
 /**
  * Represents the state of a piece.
  */
@@ -22,20 +20,4 @@ public enum PieceState {
      * The piece is finished.
      */
     HOMEFINISHED;
-
-    PieceState(){
-
-    }
-
-    public static PieceState getPieceStateByIndex(int index){
-        if (index < 0 || index >= values().length) {
-            throw new IllegalArgumentException("");
-        }
-        return values()[index];
-    }
-
-
-    public PieceState next() {
-        return values()[(ordinal() + 1) % values().length];
-    }
 }