parts designer now enforces attachment points
added attachment point to default engine
added attachment points for legs to default engine
added launch button to ship designer
added clearShips function to entity manager
parts overhaul, better explosions and rendering
Merge pull request #47 from Tritlo/shipFallsApart

parts overhaul, better explosions and rendering
updated default ships, explosions more natural
Merge pull request #48 from Tritlo/BetterShipDesigner

Better ship designer and ship parts. Ship falls apart on explosion.