Multiple changes to ScoreBar..

It now is added to PlayerBall
Score addition and subtraction through the player.
GameplayScreen now needs a goal score.
PlayerBall now needs a goal score.
ScoreBar feels less clunky, it's movement is smoother.
Update to .gitignore
Scorebar in PlayerBall and ScoreBall now has a State..

The state is used to identify it as a friendly or enemy.