TrackMate_: improve color scheme sharing in the GUI

Now all the controls for the coloring share the same settings.
Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>
TrackMate_: another attempt to protect against Concurrent modifications

Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>
TrackMate_: felsh out the config panel of the spot edit tool

Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>