Add LEAP_PREFIX qmake variable.
Enable Leap Motion controller for OS X build.
Use qmelt for rendering.

This is more reliable than trying to let MLT plugins create the Qt app
instance.
Fix setting MLT_SOURCE for webvfx in build script.
Re-fix MLT_SOURCE
Fix typo in libicui18n.so.
Improve the HtmlEditor font size dialog.
Show that Circular Frame filter is HTML.
Let a font size of 0 remove size in HtmlEditor.
Add text outline and shadow to HtmlEditor.
Add missing text_outline.qml.
Add test for "setFontSize" in HtmlEditor.
Improve support for system theme icons on Linux.
Switch shotcut back to master branch in build script.