Mouse pointer oddities (dual, tripple display; no contrast, changing of shapes)

[dvs-frbg]

There are a couple of observations:

• The pointer shape of the on-screen (touch) mouse is different to the pointer shape if a physical mouse is connected (in this case via USB)
• There are three pointers visible: The two mice (touch and physical) and if moving or resizing a window within the VM a third shape (provided by the OS) is visible (and different to the others)
• The pointer of the physical mouse disappears after a while of inactivity but not the touch pointer
• The touch pointer is quite large and just black and not visible if e.g. over a black console window within the VM (the pointer of the physical mouse changes its coloring to remain visible in every situation)

It would be convenient to make it configurable if the local mouse pointer is visible or not. The touch pointer should similarly configured, handled to the physical mouse pointer. The two pointers should be somehow merged.