NEWT/MouseEvent: Refine MultiTouch Event Spec regarding associated 'action' pointer Index; Add PointerType[PointerClass]; Add 'wheelScale' Attribute;

- Refine MultiTouch Event Spec regarding associated 'action' pointer Index
  In case an instance represents multi-touch events, i.e. {@link #getPointerCount()} is > 1,
  the first data element represents the pointer which triggered the action if individual to one pointer.
  For example {@link #getX(int) e.getX(0)} at {@link #EVENT_MOUSE_PRESSED} returns the data of the pressed pointer, etc.

- Add PointerType[PointerClass]
  This allows applications to identify the type and it's class [On-/Offscreen]
  helping to interpret semantics, e.g. wheel-rotate and new wheel-scale

- Add 'wheelScale' Attribute
  Returns the scale used to determine the {@link #getWheelRotation() wheel rotation},
  which semantics depends on the {@link #getPointerType() pointer type's} {@link PointerClass}.
  See API doc for details ..

TODO: NEWT/Android changes adopting these changes.

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