UI improvements, some bug fixes, and removal of deprecated functionality
What is new:
* Date Pickers now have a GUI (requires JavaFX, which means Java 11+ or a version of Java 8 that has JavaFX, which means either a Linux distribution with OpenJFX or Oracle Java — I know that JOSM wants to move to Java 11, which they are likely to do as soon as Java 8 is EOL, which is supposed to occur at the end of the year).
* Group filters (if the user is part of a group)
* Images are now semi-transparent if another sequence is selected
* The Mapillary Layer goes below the data layers, to make it easier to see OSM data features
* Several enhancements for viewing 360 imagery (painting while panning)
* Better detection for Mapillary source tag in changesets
* Built-in mapcss file and images for point detection (effectively disabled right now)
* UI button to disable sign detections in images (so you can see what was actually detected as a sign)
* Sign detections work again (they had been broken for awhile)
* Several crash fixes
* Some code was removed since JOSM has the same functionality (MapillaryUtils.browse() specifically)
* Organizations with private imagery can see the private imagery if they are logged in, and the appropriate setting was used at download
* Fix a deadlock
* Icon updates
* Use Mapillary's mapillary_sprite_source icons (included via git subtree, see d66d6bc, since GitHub does not export submodules as svn:externals)
What has been disabled:
* Point features and related features