CoolMaster: Change auto to heat_cool

[OnFreund]

Breaking Change:

The supported_modes configuration will now reject auto and accept heat_cool instead. If you're not using CoolMaster, or are using the default supported modes, or did not have auto in your supported modes, this does not affect you.

Description:

Changing the auto mode to a heat_cool mode in CoolMaster to better reflect what it does.

Pull request with documentation for home-assistant.io (if applicable): home-assistant/home-assistant.io#10209

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated in home-assistant.io

[balloob]

Heat/Cool means that there is a range (upper/lower set points), and the thermostat will automatically cool/heat if the current temperature goes out of this range.

Coolmaster does not seem to have the notion of temperature ranges so I am not sure if heat_cool is the right mode here ?

[OnFreund]

I may have misunderstood, but based on previous discussions I was under the impression that auto was for algorithmically determined operations, whereas heat_cool was for automatic heating or cooling based on temperature, whether a range or a single temperature (which is basically an implicit range since there's a tolerance both ways).
If that's not the case, I'm more than happy to close this PR.

[OnFreund]

@balloob see here: home-assistant/architecture#260 (comment)

If your thermostat is on a schedule, it's auto. If it's temporarily overridden to a range, it's heat cool.

In this case it's neither, but seems to be closer to a temp range than to a schedule.