- Use return values for NDOF access functions.
- Pass in event data by const reference as this is never null.
- Don't scale the angle from WM_event_ndof_to_axis_angle by the time
delta since other functions don't do this, it's strange to make
this an exception.
- Replace the term "pan" with "translation" since pan in Blender
typically refers to moving the view in 2D using cursor input,
not 3D transaction.
- Use a more descriptive term "time_delta" for the time between NDOF
motion events.
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