Engine: * Fixed aiming for Ballgun and Flamethrower

Engine: * New weapon attributes: ejectX/ejectY: Offset to the hedgehog (center of hand graphic) where the projectile(s) will be spawned * Changed Laser Sight to origin from the weapon instead of the hedgehog (needs some adjustments while walking/jumping) * Changed most weapons to no longer shoot from the hedgehog's center and use the weapon's visible position instead (might require some testing and adjustments) * Silenced the small Piano explosions

Engine: * Added some animation to Vampirism's hand graphic

Engine: * Updated Flamethrower's hand graphic and added some animation

Prevent all portal loops the guaranteed way, at least until sheepluva's tests yield something reliable.

initial support for game modifiers (schemes)

Sonic set