Land milestone 2.96

* Fix crash on reload
* Made pinch-to-zoom working as expected
* Render pages only once they become visible
* Use proper QML UI for fileopen rather then QWidgets based QFileDialog
* Lot of improvements to the QML UI
* Introduce Settings as future backend for QML+KConfig
* Added PathShape and VectorShape plugins
* Made Variables plugins proper register/display
* Added progressbar
* Android API-level is 7 now what means it works on Android >=2.1