TimePointListener - not the same API for BVV and BDV

[NicoKiaru]

Hi @tpietzsch,

I'm trying to simplify a bit bdv-playground by using the AbstractViewerPanel interface instead of my own ViewerAdapter. That dates from the time when BdvHandle and BvvHandle did not implement this interface.

It mostly works, except for timepoint listeners. Indeed, the access to timepointListeners is not part of AbstractViewerPanel interface. And there is currently a difference between the way to add a timepoint listener between bvv and bdv:

			BdvHandle bdvh = null;
			bdvh.getViewerPanel().timePointListeners().add(listener);
			
			BvvHandle bvvh = null;
			bvvh.getViewerPanel().addTimePointListener(listener);
			
			AbstractViewerPanel avp = null;
			avp.timepointListeners does not exist

Do you think you could homogeneize this ? I can try to do a PR if you want.

[NicoKiaru]

Ah, I found another thing: the getConverterSetups method exist in both BdvHandle and BvvHandle, but is not part of AbstractViewerPanel interface. Is it doable to add it ?

[NicoKiaru]

Ah, actually the convertersetup method is more problematic because it is accessible from a BdvHandle object in Bdv and in the viewer panel for Bvv.

BdvHandle bdvh;
bdvh.getConverterSetups();

BvvHandle bvvh;
bvvh.getViewerPanel().getConverterSetups()

So I can't unfortunately simplify my code because I don't see a way to get the convertersetups from the ViewerPanel of BDV (while I can for bvv).