* upgrade iottycloud lib to 0.3.0
* Add outlet
* test outlet turn on and turn off
* test add outlet
* Refactor code to use only one SwitchEntity with an EntityDescription to distinguish Outlet and Lightswitch
* Refactor switch entities to reduce duplicated code
* Refactor tests to reduce duplicated code
* Refactor code to improve abstraction layer using specific types instead of generics
* Remove print and redundant field