Xpra: Ticket #1692: usb forwarding

We usually forward devices using an abstraction:


But this doesn't work for all device types, some users may want to be able to access more esoteric devices remotely.

For that, we could use:

Sat, 23 Jan 2021 05:31:13 GMT - migration script:

this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/1692