Schedule-related improvements

[bouwew]

I realized that the thermostat-select for the legacy Anna only has one schedule-option.
The Off-option was added so the select of the Plugwise HA integration works the same as for the non-legacy thermostats.
Also, detection of an empty schedule was added.

Finally, a small correction was made for actual devices.

Furthermore, all in [..., ...] constructs were replaced by in (..., ...) constructs including one typing-item in constants.py: Final[list[str]] to Final[tuple[str, ...]].
And, some double used code was replaced by a common function, common_match_cases().

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (f72847c) to head (b31d57b).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #558   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           20        20           
  Lines         3150      3138   -12     
=========================================
- Hits          3150      3138   -12     

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
2.3% Duplication on New Code

See analysis details on SonarCloud