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.
Is there an example where to MarkerSets are in fact merged? I have seen internally (part of the Model) defined and externally defined (MarkerSet file) but I don't recall one where we had to merge the two. I don't think this makes any sense.