title: vvvv/SVG not rendering text
body: <p>I'm trying to use vvvv/SVG library (<a href="https://github.com/vvvv/SVG" rel="nofollow">https://github.com/vvvv/SVG</a> , current version) in my C# project. I've managed to do some simple drawing, however ended on strange behaviour when rendering text.</p>
  
  <p>Following code adds text element to SvgDocument, but no text is rendered in bitmap. </p>
  
  <pre><code>        this.SvgDoc = new SvgDocument();
          this.SvgDoc.Width = new SvgUnit(400);
          this.SvgDoc.Height = new SvgUnit(400);
  
          SvgText txt = new SvgText("TEST");
          txt.X.Add(new SvgUnit(100));
          txt.Y.Add(new SvgUnit(100));
          //txt.FontFamily = "Arial";
          txt.FontSize = new SvgUnit(15);
          txt.Fill = new SvgColourServer(Color.Black);
          this.SvgDoc.Children.Add(txt);
  
          var bmp2 = this.SvgDoc.Draw();
          this.PBoxRes.Image = bmp2;
  </code></pre>
  
  <p>If I try to add eg. circle node, it renders ok. Text will not render until I store svg to string, parse it with SvgDocument.FromSvg() and render bitmap after that. That's working, however too slow with larger SVG and minor changes. Is there something I can do to make the text renderable imediatelly, without reparsing?</p>