* http: Add headers key to json[_message]
* Add google_assistant component
This component provides API endpoints for the Actions on Google Smart
Home API to interact with Google Assistant.
* google_assistant: Re-add fan support
* google_assistant: Fix Scene handling
- The way I originally wrote the MAPPING_COMPONENT and the way it's actual
used changed so the comment was updated to match that.
- Use const's in more places
- Handle the ActivateScene command correctly
* google_assistant: Fix flakey compare test
Was failing on 3.4.2 and 3.5, this is more correct anyway.
* google_assistant: Use volume attr for media_player
