Add support for Warema EWFS blinds

[m0uH]

I have some blinds I so far control with the original RFLink, but would like to switch to an ESP32. Therefor requesting to add support for Warema EWFS blinds.

Beside sending commands to the blinds I'd also like to detect if the remote was used to control the blinds.

I can also assist in implementing this support but need some guidance on how to get the signal en-/decoded.

The signal has been recorded already in other projects:

• https://community.openmqttgateway.com/t/warema-ewfs-rf-433mhz-sunblind-controlling/1341
• https://github.com/rfkd/aircontrol/blob/develop/etc/aircontrol.conf#L57

Probably the first step would be to print the detected raw/undecoded signal after pressing buttons on the remote. Unfortunately I did not find how to enable this. Setting RFDEBUG=on does not change anything.