[openwebnet] adding support for central unit (#12062)

[openwebnet] adding support for central unit (#12062)

* - read 'standAlone' flag from thing
- send standAlone flag to own4j for setting the temperature on central unit
- own4j 0.7.1 required
* added localmode and central unit thing
* added localOffSet channel to readme.md
* added remoteControl, batteryStatus and modeCentralUnit for bus_thermo_cu
* added weekly and scenarios to modeCentralUnit
* - manual setting of a zone to T temperature (with persistence in central unit)
- manual setting of central unit to T temperature (all zones)
- set the central unit in OFF mode (all zones)
- set central unit in thermal protection (all zones)
- set central unit in antifreeze mode (all zones)
- weekly program activation command (all zones)
- scenario activation command (all zones)
* renamed cu's channels name
* removed unused channel 'modeCentralUnit" from readme
* fix #12298
* - add configuration section (where) for BusThermoCentralUnit
- strings ("OK", "KO", "ENABLED", "DISABLED" converted to constants
- fix typo

Signed-off-by: Conte Andrea <andrea@conte.com>
Co-authored-by: M Valla <12682715+mvalla@users.noreply.github.com>