Effect sound of power up orange
BUGFIXED: Repetitive sound when catching PowerUps
Power Ups on fire! Only next things to do the mixes of various power ups.
New xml level for gameB. Enemy WeakShotB has movement. Enemy MineShotB calibrated. Scores label and scores added to all modes.
Bug fixed: Power ups shows banner when not caught and the catchable time is 0.

Started with the flicker of the enemies at spawning. It isn't working. Re factorized a few functions of enemy.
Merge branch 'master' into PowerUps

Conflicts:
	IS_XNA_Shooter/IS_XNA_Shooter/IS_XNA_Shooter/IS_XNA_Shooter.csproj.Debug.cachefile
	IS_XNA_Shooter/IS_XNA_Shooter/IS_XNA_ShooterContent/IS_XNA_ShooterContent.contentproj
Change the values of the enemies.
Merge branch 'PowerUps'