[winswitch] [ANNOUNCE] Xpra 2.2.4: minor fixes

[Antoine Martin]

Hi,

This update fixes a fair number of minor issues, none of them critical,
there is no urgency to update if you were not affected.

Binaries are available for all platforms again, including MS Windows and
Mac OS. Those include the usual minor library updates from upstream.

Release notes:
* fix lost connection when using bandwidth system tray menu
* fix miscalculations in bandwidth congestion detection
* fix bandwidth spikes with non-video fallback
* fix video encoder setup errors with invalid size requests
* fix x265 codec spurious logging
* fix python3 OpenGL client wrongly using default values (slower)
* fix handling of geometry constraints on MS Windows
* fix unreliable unit tests (use relative time in sample data)
* fix webcam forwarding errors in encoding selection
* fix error in mmap setup error handling
* fix shadow server startup error with Python 3 builds
* fix NVENC informational message contents
* fix NVENC support for memoryview uploads
* fix session browser link from the launcher
* fix launcher color error with GTK3
* disable webcam support in 32-bit MS Windows builds (broken library)
* disable NVFBC zerocopy using CUDA buffers (pending further testing)
* don't log exceptions that don't exist, re-use existing exception
* always clean builds by default (MS Windows)

Links:
https://xpra.org/trac/wiki/Source
https://xpra.org/trac/wiki/Download

Cheers
Antoine