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!