New unstable release, including: * New ActorContainer as a top level UI editor for SVG shapes, allowing paning and inserting new shapes * New Actor and ActorShape interfaces for SVG management * New ActorText, ActorCircle, ActorEllipse, ActorLine and ActorRect interfaces for shapes management * New Clutter implementation for interfaces, based on Clutter.Actor to manage shapes on screen * New Editor interface and Clutter implementation to track changes to SVG elements * New DrawingArea interface and Clutter.Canvas implementation for SVG rendering area * New SvgRenderer interface and librsvg implementation for SVG rendering * New Positionable interface for object position tracking * New ActorResizable interface for actors size tracking/changing * New Changes and Change interface for track changes on SVG elements, as first steps for undo actions * New interface API allowing multiple future implementations * All actors start using mm as standard units, so SVG can be rendered, preserving scale ration and form, to PDF or to printers * All Clutter shape actors allows to move objects on stage, showing current position in millimeters