Faces - portrait image referen

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v 1.3:
+ Now you can see up to 6 recently opened images
+ Small UI changes
+ Update to the latest Android requirements
+ Small performance improvements

v 1.2:
+ Added quick way to see the image you opened last time
+ New Contrast tool
+ Small UI improvements
+ Fixed issues with RTL languages

v 1.1:
+ Added grid tool. Now you can switch on and customize grid displayed over reference image