MaMuT_: TrackScheme and the mamut viewer share selection properly

Signed-off-by: Jean-Yves Tinevez <jeanyves.tinevez@gmail.com>
TrackMate_: make some fields protected

Signed-off-by: Jean-Yves Tinevez <jeanyves.tinevez@gmail.com>
MaMuT_: custom control panel

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