Some Physics changes and Fmt.

OnComponentBind(g *gameObject) is now OnComponentAdd().
Changed NewPhysics functions.
Fmt'ed all the files.

to quickly fix the functions:
gofmt -r "engine.NewPhysics(b,w,h) -> engine.NewPhysics(b)" -w .
gofmt -r "engine.NewPhysics2(b,s) -> engine.NewPhysicsShape(b,s)" -w .
gofmt -r "engine.NewPhysicsCir(b,r) -> engine.NewPhysicsCircle(b)" -w .

needs to be done manually:
OnComponentBind(g *GameObject) -> OnComponentAdd()