Merge changes from topic "ToupadPointerCapture"

* changes:
  Revise RELATIVE_X and RELATIVE_Y motion ranges documentation.
  Populate RELATIVE_X and RELATIVE_Y motion range for touchpad pointer capture mode.
  Fix MultiTouchInputMapperTest#Process_TouchpadCapture test failure.
  Add relative field to captured cursor device
  Add relative coordinates for touchpad events.
  Support "pointer" capture for touchpads
  Allow touch if some pointers are MT_TOOL_PALM
  Convert TouchInputMapper enums to enum classes.