I have started implementing a Viewer (Java application with graphical user interface), which is able to replay any sprite animation of this game. At the moment the application is able to open an xml and play/pause the animation. Also it is possible to change the animation speed (time factor). Furthermore each frame of an animation can be exported to a single image file. I will post the application here as far I get the GUI finished.
The next step will be implementation of useful editing features. like editing sprites of particular frames. Also I plan to implement a layout editor to pack several sprite images of a single animation into a png file. There will also be some automatic layout strategies to reorganize the images in order to get them tightly packed.