Fixed up default values for Layer, Circle, AxisAlignedRectangle, Sprite, Text, and Camera.
Fixed up default values for Layer, Circle, AxisAlignedRectangle, Sprite, Text, and Camera.

vchelaru/FlatRedBall,vchelaru/FlatRedBall,vchelaru/FlatRedBall,vchelaru/FlatRedBall,GorillaOne/FlatRedBall,GorillaOne/FlatRedBall,GorillaOne/FlatRedBall,vchelaru/FlatRedBall,GorillaOne/FlatRedBall