add resetCounter method to player entity and integrate into game reset

src/de/miaurizius/jgame2d/entity/Entity.java

@@ -621,5 +621,14 @@ public class Entity {
             invincibleCount = 0;
         }
     }
+    public void resetCounter() {
+        spriteCount = 0;
+        actionLock = 0;
+        invincibleCount = 0;
+        shotAvailableCount = 0;
+        dyingCount = 0;
+        hpBarCount = 0;
+        knockbackCount = 0;
+    }
 
 }