Added Pause Function, Sound Effects, and Fixed Bugs

-Pause function is now properly working (stops rendering of images and
resumes rendering of images upon clicking the resume game button)
-Pause Screen now includes working resume game, restart game and quit
game buttons.
-Strong Minions are now properly created and destroyed.
-Projectiles are now properly destroyed.
-Random Fireball are now properly destroyed.
-Sound effects 50% done.
-View transitions are now properly implemented.