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

[Dead Horse]

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. Again probably best suited to have this on
console configuration UI for a VM in the admin and user portals.
- Default VRAM sizes are not enough to allow for larger resolutions and
pixel depths at times.
- Especially the case in multiple monitor SPICE, fullscreen, or VNC consoles

- More VRAM is useful in the case of attempting to run accelerated
applications within a QXL configured guest.

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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