Adds support for many, but not all Everspring devices

This is the test release. Currently implemented:

- Everspring AD146 (In-wall dimmer)
- Everspring AD147 ( Dimmer plug )
- Everspring AN180 ( On/Off plug )
- Everspring ST814 ( Temperature & Humidity sensor )
- Everspring AN181 ( On/Off plug with power metering)
- Everspring ST812 ( Water alarm detector ) [ BETA ]
- Everspring / Nexa SP816 ( PIR motion sensor [ BETA] )
- Everspring AD142(2) ( Dimmer plug )
- Everspring AN157 ( On/Off plug )
- Everspring AN158 ( On/Off plug with power metering)
- Everspring AN179 ( On/Off In-wall plug) [ BETA ]
- Everpsring HSM02-1 ( Door/window detector )
- Everspring HSP02 ( PIR motion sensor )
- Everspring SF812 ( Smoke detector )
- Everpsring SM103 ( Door/window detector )
- Everspring SP103 ( PIR motion sensor )


As I don't own all implemented Everspring devices, there might be issues.
Please report them!