Added ability to include children in the json to addSvgElementFromJson().
Added ability to include children in the json to addSvgElementFromJson().

SVG-Edit/svgedit,ubbn/svgedit,thewenneur/svgedit,thewenneur/svgedit,SVG-Edit/svgedit,thewenneur/svgedit,ubbn/svgedit,ubbn/svgedit,SVG-Edit/svgedit,thewenneur/svgedit,ubbn/svgedit