Better looking player bullet
Starting to untangle the web of hierachical mess in the entity space, starting with flash animations
More refactoring to tease apart entity hierarchy, encapsulated standing updates
Finally rid of the stupid Entity class. Good riddance
Removed leftover junk code from turrets
Mutual damage between player and turret.
Turrets firing bullets... kind of
fully armed and functional turret cannons
Added invulnerability after getting hit by enemy fire.