Fix: Fixed Various "toString" Method Issues + Relative Tests.

src/main/java/it/polimi/ingsw/gc14/Model/PlayableCard.java

@@ -43,6 +43,6 @@ public abstract class PlayableCard implements Serializable {
      */
     @Override
     public String toString() {
-        return "⌛:"+String.valueOf(Era);
+        return "⎕:";
     }
 }