A track splitter that works, but still not optimal.

Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>
Finally a track splitter that works.

It took me ages to get there. Until I understood it makes no sense to do
it by hand. Trust the graph library we have to do it!
Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>
Fix typo in class names.

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

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