Resolve "Reduce health points on hit"

frontend/core/src/com/game/tankwars/CollisionDetection.java

...core/src/com/game/tankwars/controller/GameController.java

frontend/core/src/com/game/tankwars/model/FixtureData.java

frontend/core/src/com/game/tankwars/model/Tank.java

frontend/core/src/com/game/tankwars/view/GameHud.java

frontend/core/src/com/game/tankwars/view/GameScreen.java