Studio projectiles [finishes #70373952]

New Sprite class used for projectiles (may be used for all Sprites in the future)
New block to throw a sprite (fireball or flower - art pending) in a particular direction from a sprite
New changes to the collision event block to allow code to run when a sprite collides with a "class" (such as any fireball, flower, etc.)
New block to make a fireball/flower bounce or disappear - with magic that understands which one you want to operate on based on the event that you are handling.

Also, a fix to chrome34fix