[IDEA] MWS - Shema overview

[pmario]

@Jermolene @webplusai -- I did create a MWS schema overview as SVG with the program DBVisualizer. This one helped me a lot to actually understand the connections. The problem now is, that we do not have a version number for the plugin.
So I can not really add the version to the SVG, which imo would be important. I did add the commit hash for the time being.

Created with commit: 0cd2190