Android "desktop" app: More hacking on scaling

Added a new "mode" for the CommandWheelData, COMMAND_WHEEL_ZOOM_SCALE, where
the "delta" is the scale percentage to multiply the curent zoom factor
with. Implement in Writer and Calc.

But actually, I am more and more startng to think that live scaling of the
document view during the pinch/spread gesture will never perform fast
enough. Need to go back to the (simple) trick to just scale the BitmapView,
and do the actual LO re-zoom only when the gesture finishes. But in order for
that to look nicer, need to get rid of the LO UI element clutter around the
document, scrollbars, buttons etc. Plus of course need to make sure the LO
zooming happens around the gesture center position.

Change-Id: I20dfcb4c2a97aacbf7e5b6ea5c24816b237fe687

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