for extending the RFB-Protocol by an own decoder, add it to the decoder section
in the VNCClient.Config.xml file.
Use the fully qualified name of the decoder in the config-file.
If the decoder is in a separate dll, append the name of the dll to the name after a comma,
eg. VNC.RFBDrawing.UpdateDecoders.MyOwnDecoder,decoder for MyOwnDecoder in decoder.dll
A decoder which should be usable here, must provide a no-argument constructor.