Demo 1.04 - Fading music and sorta-fast-switching-powerups!

Music changing abruptly is kinda goofy, so now it doesn't do that! Also, started experimenting with the fast-switching of powerups (And finally fixed the powerup rotation order (Instead of Nothing>Jetpack>Pogo, it goes Nothing>Pogo>Jetpack, so doing a jump+jetpack thing works more easily).

I,J,K,L now switch powerups with or without the spacebar. Gamepad fast-switching not yet supported, but will be eventually (Likely bound to right-joystick).