Define list of official supported plugins

[simon04]

I started to classify them to see how we could merge some of them together.
For example, merge the different "fileformat" plugins together, and the different "streetimagery" together.

@floscher: would you like to see for the streetimagery ones? ;) A unified way to present Mapillary/StreetSide/OpenStreetCam would be awesome :)

[taylor.smock]

This is an old bug, but I'll throw my two cents in here, since I've been working on the Mapillary plugin recently.

1) Improve the ImageDisplay class so that it has all the features from the Mapillary plugin (currently missing: no image flickering (#17072), 360 support (#16472), and detections/additional drawing).
2) Have an Data class for images and image sequences (probably extending OsmData)
3) Possibly modify JOSM's GeoImage display to have tabs (e.g., "GeoImage", "Mapillary", "OpenStreetCam", and "Microsoft Streetside") while also having the option of multiple windows (so a "Mapillary" and "OpenStreetCam" image could be compared side-by-side, for example). There would probably have to be some methods to add additional actions though (e.g., "Walk", "Turn off detection drawing", etc.)

I don't think it will be possible to do common image filtering (it would be nice, but either we would have to ensure that everyone uses the same key/value combinations, or pawn it off to the plugin).