finish the basic functions
	modified:   src/com/example/buildloft/PhysicsExample.java
	renamed:    src/com/example/buildloft/sprite/intf/AbstractSprite.java -> src/com/example/buildloft/sprite/intf/AbstractGameSprite.java
	renamed:    src/com/example/buildloft/sprite/intf/AbstractGameSprite.java -> src/com/example/buildloft/sprite/intf/AbstractPhysicsGameSprite.java
	renamed:    src/com/example/buildloft/sprite/intf/AbstractGameSpriteBatch.java -> src/com/example/buildloft/sprite/intf/AbstractPhysicsGameSpriteBatch.java
	new file:   src/com/example/buildloft/sprite/intf/AbstractSimpleGameSprite.java
	renamed:    src/com/example/buildloft/sprite/intf/InterfGameSprite.java -> src/com/example/buildloft/sprite/intf/IGameSprite.java
	new file:   src/com/example/buildloft/sprite/intf/IPhysicsGameSprite.java
	new file:   src/com/example/buildloft/sprite/intf/impl/AndButton.java
	modified:   src/com/example/buildloft/sprite/intf/impl/Board.java
	modified:   src/com/example/buildloft/sprite/intf/impl/Circle.java
	modified:   src/com/example/buildloft/sprite/intf/impl/Crane.java
	modified:   src/com/example/buildloft/sprite/intf/impl/CraneMachine.java
	modified:   src/com/example/buildloft/sprite/intf/impl/Link.java
	modified:   src/com/example/buildloft/sprite/intf/impl/LinkItem.java