healthbar inherits from group to allow rectangle children
healthbar inherits from group to allow rectangle children

ruslan120101/TankAttack-JavaFX,ruslan120101/TankAttack-JavaFX,ruslan120101/TankAttack-JavaFX,ruslan120101/JavaFX-TankAttack,ruslan120101/JavaFX-TankAttack,ruslan120101/JavaFX-TankAttack