This allows sending cursor updates, including position and cursor
sprite, without having to embed it into the framebuffer. In effect, when
there is a hardware cursor in the compositor, moving the cursor will not
result in any actual frames being copied.

The actual cursor sprite sent over VNC is derived from the cursor sprite
used in the compositor. The conversion is lossy, as the VNC cursor
sprite is a 3 bits per pixel (transparen, white or black), and the cursor
sprite from the compositor is 32 bits per pixel.

This bumps the PipeWire requirement to 0.2.5.