Added support for service responses when calling or creating services. #495
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Added support for returning service responses for both service execution and service creating.
Calling Services:
The user can now call services and get responses back. This works for both ways of calling services, via service.call() and also when using the service name as a function. Users can now use the argument "return_response = True" when they are interested in getting a response like this:
retval = service.call("mydomain", "myservice", return_response = True, ...)
or
retval = mydomain.myservice(return_response = True, ...)
When the called service has been created with "SupportsResponse.ONLY", then "return_response = True" is automatically assumed when not explicitly given by the user.
Creating service:
The user can now use the keyword argument "supports_response" to specify whether the service returns a response when creating a service using the @service decorator:
The argument "supports_response" accepts the same values as the underlying home assistant API: "none" when no response is returned, "optional" when optionally a response can be returned or "only" when a response must be returned. Default value of "supports_response" is "none".