Convert QGLWidget to QQuickView and rewrite OpenGL.
Add vui property to QmlMetadata and connect it to GLWidget.
Replace video scroll area with scroll bars and OpenGL model-view.

Also, exposes the zoom and scroll as object properties to QML.
Fix resetting the VUI QuickView after some filter events.
Add getRect() and set-mlt_rect to QmlFilter.
Add aspectRatio property to QmlProfile.
Add changed signal to QmlFilter for UI<->VUI signal change.
Enable zoom button on OS X.
glFlush needed after uploading textures.
DPI needs to be factored into the model view translation.
Add QML RectangleControl.
Add Size and Position video filter.
Fix paths to local libs using qmake debug_and_release.
Fix some Qt signal connection errors on Windows.
Fix Movit assert resizing rectangle size <= 0.
Add producerAspect property to QmlFilter.
Make QmlFilter::set() methods emit filter.changed() signal.
Change multitrack to replace composite and remove movit.rect.
Add size mode and alignment to size and position filter.
Remove useless line.