Update Rules

I am adding new rules to the game to make it more interesting. Those updates are:

• Make the energy drained over time with the start of 12 energy
• Add end screen to display score of how many bread is collected
• Enable the game to restart when player click on the end of the game

In order to create end screen, I need to implement isStopUpdate function on common behaviour at my library, gogeta (based on ebiten), so all object can be paused during end screen.