Initial commit of the new QtQuick-based code.
WindowTool: do not force tab creation
Repository: force QQmlEngine not to take ownership on get()
Repository: fix threading issue with QAbstractListModel
Cleaned up WindowTool, removed 'Window List' label.
Renamed member variables to use Qt-style m_ prefix.
Forgotten editing for previous commit.
Moved drawing functions from ItemWindow to IWManager. Cleaned up.
Implemented ScenegraphAggregator, optimized IWManager.

Scenegraph now contains a QSet of all possible frames for it's items.
ScenegrapgAggregator contains an union of all Scenegraph sets, calculates
min/max frame number and gives that to TimeLine. Also signals on frame
change.

Removed QObject inheritance from data items -- not needed anymore.
Updated CXX_FLAGS
Implemented Repository::clear(); ScenegraphAggregator now singleton.
Fixed build. Handle insertion of items into known Sequence
Use QtQuick.Layouts everywhere; added View menu
Updated KinectRecorder
Exposed RepositoryNode properties to QML
Merge branch 'master' into qtquick
Use slider-spinbox bindings in TimeLine
Implemented ProcessingDialog and VideoPipeline.

Also minor clean-up in VideoHelper/VideoSource.
Reimplemented Config on Qt, added ConfigView.

Dropped Boost
Cleaned up VideoSourceOpenCV/VideoHelper, added some
error handling
Updated README, added documentation