Touch and shuffle.

Implement touch and shuffle.
Merge branch 'master' of
https://github.com/trietto/picture-puzzle-xt.git

Conflicts:
	project/PicturePuzzleXT/assets/ImageCell.qml
	project/PicturePuzzleXT/assets/main.qml
	project/PicturePuzzleXT/src/PicturePuzzleXT.cpp
	project/PicturePuzzleXT/src/PicturePuzzleXT.hpp