virglrenderer for 3d support

[SInisterPisces]

Vulkan support is a gamechanger! Now, Proxmox team, please jump in!

This will be a pretty major change.

See the staff's response over here: https://forum.proxmox.com/threads/qemu-9-0-available-as-of-now.149772/post-728527

ETA: We most likely won't see this before Proxmox 9 next year, but it's coming.