[Users] Feature request: allow usbtablet and vram config via UI

[Chris Brown]

Allow for a usbtablet input device to be enabled and used. Perhaps via the
console configuration UI for a VM in the admin and user portals.
-Highly useful in the event that a guest OS does not have the spice agent
loaded nor is it available for said guest OS.
-Also in the case of guest OS that simply does not want to work and play
well with <input type='mouse' bus='ps2'>
- All Operating systems since ~1998 understand <input type='tablet'
bus='usb'/> and will deal with mouse events in absolute mode

Allow for vram and vram_ size to be configurable for CIrrus(VNC) and
QXL(Spice) console types.
- Default VRAM sizes are not enough to allow for larger resolutions at
times.
- Especially the case in multiple monitor SPICE, fullscreen, or VNC consoles

The above can be altered via VDSM hooks however this is rather painful.
Additionally these options or similar are configurable in other competing
solutions.

- DHC
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