REQ: Process Qizmo voice packets (low priority)

[meag]

Describe the solution you'd like
Some old demos have svc_qizmovoice (83) packets, that the user should be able to play back when watching the demo.

Currently these are read & skipped, although some-one seems to have worked out some pattern to the packet in the past. (https://github.com/ezQuake/ezquake-source/blob/master/cl_parse.c#L3456-L3466)

No idea if this was ever solved further.

Describe alternatives you've considered
Watch the demos through qizmo with game sounds disabled and commentary turned on. Record audio with external tool, then re-encode the demo with svc_qizmovoice removed and svc_fte_voicechat packets inserted instead.