Xpra: Ticket #1445: support 8-bit pixel depth server

Split from #1315.

This can only be supported in "start-desktop" mode since these framebuffers don't support the composite extension.

Mon, 20 Feb 2017 09:08:14 GMT - Antoine Martin: status, milestone changed; resolution set

Done in r15123, see wiki/ImageDepth.

Sat, 23 Jan 2021 05:24:30 GMT - migration script:

this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/1445