Xpra: Ticket #2294: untangle vfb from server startup code

See #1123, and in particular ticket:1123#comment:10 : find a way to move display related stuff into the server class, delaying the actual bindings initialization until we have a display to connect to.. (hard)

Wed, 12 Feb 2020 05:20:06 GMT - Antoine Martin: status, milestone changed

Sat, 23 Jan 2021 05:47:22 GMT - migration script:

this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/2294