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In support of improvements to scroll wheel support, some mice or features thereof are missed by the ancient mouse support in USBDriver. Update that a little, but stopping before the mass rename of structures that NetBSD's USB stack has done, and before digitiser support which just adds to the confusion.

So far

• It builds

To do

• Re-plumb attach_mouse() to call the respective parts of uhidev (and indirectly ums)
• Re-plumb detach_mouse()
• Veneer to ums_intr() via riscos_ums_int()

This strategy avoids having to pull in reams of other code more generally, since the only interface to the rest of USBDriver is through those 3 functions, and they can be mapped between as the function arguments haven't changed that much.