More Powerups and some more adjustments

-Added a fire rate powerup that increases fire rate

-Added a bullet life powerup that increases the lifetime of a bullet

-Added a bullet speed powerup that increases the speed of a bullet

-Addded a handling powerup that increases turning speed

-Added a ship size powerup that increases the size of a ship

-Added a bullet size powerup that increases the size of the bullet

-Player no longer turns at maximum speed immediately, it now takes about 4 frames to reach max turning speed. This is to allow light tapping for aiming

-The Boss's bullets now do 100 damage instead of 30

-Fixed an issue where your redistributed powerup stats on death all base themselves off of the speed value

-Fixed an issue where the splitter enemies did not drop their powerup or white mineral

-Enemies can now only drop the first 5 powerups they picked up. They cannot drop more. (does not apply to player or boss)

-The splitter enemies (except for the tiniest one) can only drop 1 powerup