Added a move counter, level goal, restart screen & end of level screen

Implemented a moves counter, which counts down from the max number of moves to complete the level. Once they've run out of moves and the chair has stopped moving, the restart screen will pop up, with a button that restarts the level

Level goal - not the chair, the green circle. Touching it brings up a level end screen, with a button that sends you to the next level.

Restart screen - the text is a button that restarts the level. Note that "Moves left" is at 0.

End screen - the text is a button that starts the next level. Note that "Moves left" is at 0 - the player has taken their final shot, but they were still moving when they reached their goal. They've bounced off and fallen over, which is deliberate - really trying to make the physics based nature of the game apparent in everything.