* Fixed ActorImage implemenentation
* Fixed integration to libgtkcanvas project
* Removing warnigs and debug messages

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

Initial version with support for:

* New SVG Image Viewer
* Meson and Autotools build systems