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.
Merge branch 'master' into partCollision
fixed bug when line is vertical, added lots of checks where debugger should break
Merge pull request #49 from Tritlo/fixVerticalLineBug

fixed bug when line is vertical, added lots of checks where debugger sho...
Merge branch 'master' into partCollision
If the hitBox is correct, it is drawn correctly, note that hitBox is not correct with respect to rotation, put on ly position
WIP partCollision
parts now collide
Merge branch 'master' into partCollision
added time alive and immunity at start
Merge branch 'master' into partCollision
now both entities explode