Merge pull request #11 from webOS-ports/tofe/compositor-integration

Tofe/compositor integration
QML: Improve window management

 * Move some logic to compositor.js
 * Add a notification area
 * Add a fullscreen window container, which is above status bar and notification area
 * Put two buttons in DummyWindow as PoC, to switch between window states and to add a widget to the notification area

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>
Rename compositor class and add native window wrapper class

Signed-off-by: Simon Busch <morphis@gravedo.de>
Merge remote-tracking branch 'origin/tofe/compositor-integration' into morphis/for-build
Merge remote-tracking branch 'origin/morphis/compostior-native-classes' into morphis/for-build