Movement and Enemies

I've fixed the character's movement so that it's smooth and corrects
velocity when no buttons are held down. As well as that, I also added
the humble beginnings of the enemy army, the one dubbed BadRobo. At the
moment he just flies around in a rather slapdash fashion, attempting to
follow the player. Soon, he'll be shooting tens of thousands of dragons
out of the sky in a merciless frenzy of rage...