Merge pull request #159 from bog-dan-ro/master

Fix compile on Android.
QtQuickControls mockup
Merge pull request #160 from bog-dan-ro/work/android

QtQuickControls mockup
Remove unused IdleWidget
Move Widgets to Widgets/

Start separating widgets code from everything else, to be able to build
without QtWidgets dependency, for the QML version. This will need some
refactoring to remove all widgets dependencies from the common classes.
Move qtkeychain to its own subdir
Remove unused OpeningScene.h
Clean up the build files

Simply list files instead of using wildcards and then removing stuff.
The file list in .pro  will get shorter once we don't build widgets
on Android anymore.