En route for v0.13.0

Signed-off-by: Jean-Yves Tinevez <jeanyves.tinevez@gmail.com>
Refactor loading/launching.

Loading and launching logics have been moved out of the MaMuT class to
plugin classes.
Now the MaMuT class just loads the image data and receive a blank or
configured model and settings from an external caller.
Signed-off-by: Jean-Yves Tinevez <jeanyves.tinevez@gmail.com>
Entry-point to load TGMM results in MaMuT.

At the present time, depends on the specific fernando-import branch of
TrackMate.
Signed-off-by: Jean-Yves Tinevez <jeanyves.tinevez@gmail.com>