Added configuration for the new WIFI device sold by Obi (#1408)
* Added the configuration for the second generation OBI devices.
* Added link to the OBI Wifi Schuko Plug V2 as well as included the device in the readme.
* Restored the default configuration accidentially changed by a previous commit.
* Renamed the OBI-V2 device to EUROMATE_WIFI_STECKER_SCHUKO_V2 as suggested by mcspr.
* Fixed spelling of comment to the proper wording Schuko.