Matt ayman frames

Redo of the merge of Frame, RigidFrame, FixedFrame, Station and Marker ModelComponents along with code to convert Marker to new format for serialization/deserialization and inclusion of FrameSet in model.
@sherm1 @msdemers @aseth1 or @chrisdembia Please review and let us know your feedback.
> * to which components can be attached, such as markers. The Frame allows ...

Is not true of all Frames, cannot attach Joints, Constraints or Forces to Frames in general, only RigidFrames.