RTL_433, added support to Efergy e2 CT

[jyvern]

I've patched on my local installation the Rtl433.cpp file to add support to the Efergy e2 CT modules. As I'm not expert to git and the way to do a pull request, I need some advice and help for that.
It still needs also some adaptation to handle the conversion from current to Watt which is depending of the tension (230v in my case)

[elgringo]

Is this already in the latest beta?

[jovibelma]

Hello, can you help me how integrate into domoticz, I have a efergy elite and I already intalled Rtl433 dongle and I receive data from wheather stations but not from efergy.
Thanks