Changes since v1.18:
 - Implement (optional) buffering (#2464)
 - Make --turn-screen-off work even if --no-display (#2426)
 - Workaround Windows issue with non-ASCII path (#2619)
 - Print correct error messages on Windows socket errors (#2624)
 - Upgrade platform-tools to 31.0.3 (adb) in Windows releases (#2588)
 - Upgrade SDL to 2.0.16 in Windows releases (#2589)
 - Various technical fixes