[winswitch] [ANNOUNCE] Xpra 4.2.1 - many fixes, some critical

[Antoine Martin]

Hi,

This update contains a large number of fixes in the areas of build and
packaging, the proxy server, some specific platforms (MacOS and MS
Windows), the networking layer, encodings, etc
Some of these are critical:
* proxy server fixes - big thanks to Vasyl Gello
* MS Windows crashes during printer enumeration
* ffmpeg codec crashes
* webp encoder invalid memory access
* SVG icon loading causing crashes

The more detailed release notes can be found here:
https://github.com/Xpra-org/xpra/releases/tag/v4.2.1

Downloads:
https://github.com/Xpra-org/xpra/wiki/Download

Cheers
Antoine