[BTicino/OpenWebNet] New openHAB2 binding ready for testing

@Marcello_Chiara
The Openwebnet binding is active.
Massimo is implementing CEN and CEN +
Currently the AUX and alarm commands are not implemented.
Soon it will be official on OpenHab, read beta8, the beta8 has no CEN, CEN + see link
For AUX I implemented on 1.X bindings see link
For Alarm I do not know …

I use MH202 with Bticino works well with Openwebnet 2.x co of @massi.