SVG to GraphRep transformation and various fixes

Added a functionality which generates GraphRep code out of SVG XML code. This is similar to what the GraphRep Editor does.
The results can vary, as the transformation in the online GraphRep Editor is specific to what the editor provides, while the functionality in the VSC Extension works on SVG "in general". It does not support 100% of all the possibilities of SVG, but it has been tested with SVG from the online GraphRep Editor (or rather its SVG editor SVGEdit and with SVGs as stored by Inkscape and also some other tools that could be quickly found.

Also support for region markers has been added to AdoScript, LEO and LEO-grammar. See VSC User Guide for details.

Furthermore several issues have been fixed (#24 (closed) #25 (closed) and #26 (closed)) and a new InstallAdoxxAdoScriptExtension.gif created.