[Unit Tests] Rename test class to proper name
[DiagramUtils] Allow image scaling to go up to factor 5
[AbstractDiagramEditor] Add more Zoom levels to diagram editor
[Figure Icons] Figure Icons are drawn on graphics canvas

* No longer use 16x16 images
* Icons are drawn on graphics canvas
* Allows greate zooming and SVG export
Add a scale factor to PNG/BMP/JPEG Image Export
Merge branch 'figure_icons'