Minor configuration changes
Added getter for Physics.body
Added prefabs for test entities
Used prefabs for test entities; Added Entity.parent
Removed Entity.clearSiblings due to removal of remove control
Made Entity add all of its renderableControls to RenderManager rather than having individual Controls add themselves to REnderManager
Added Shape.scale(), implicit conversions, and Application.physicsDebug
Moved and renamed Shape2Box2DImplicits; Added Vector2 and (Float,Float) to Vec2 conversions
Changed vector2vec2 conversion to use -v.y
Changed Camera.offset
Added ImageRender
Added Physics.filter
Added EntityConversions and Camera.follow