Integrate Siemens Logo (plclogo) in OpenHAB 2

Thanks @Brecht, @skazi, @mcullmann,
I have created a new turorial/solution topic for this - still WiP

@rlkoshak please make that a wiki.

Next should be rolloshutters.

Thren I have a challenge for Logo clocks. How to write times? Reading times works already nicely with plclogo-binding.
Android HMILogo app does that with a perfect widget (3 tabs for 3 clocks, weekday-selector, on/off-time reader + setting)
HMILogo_clock_widget