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.
@aseth1 @sherm1 @aymanhab Just realized I didn't complete the original thought.   If a station must be fixed on the multibody stytem, it must sit on a RigidFrame.  If you all agree that a Station is any point, whether fixed to the multibody system or not, Frame would be appropriate.  I have no preference there.