This commit adds a new option to the heat_control component, ac_mode.
When set to true, this treats the toggle device as a cooler instead
of a heater. The concept being if you have a window or in-wall ac
unit that doesn't have a built-in thermostat having the home assistant
implemented thermostat would be as useful as for space heaters.
* Log error for services called without required attributes, in
media_player, notify and thermostat platforms.
* Add fan property and methods in thermostat demo component.
* Add tests for notify file and thermostat demo component.
* Increase coverage of tests for media_player, notify and thermostat
platforms.
* Fix some PEP issues, but not all. Tests still have old linting
errors.
