Rework tado component

[michaelarnauts]

Description:

This PR reworks the Tado component:

• Use the dispatcher and should_poll=False on the entities. This fixes some timing issues where we had to wait an additional polling period for the entities to get valid data.
• Removed functions that were not implemented and we don't need according to our SUPPORT_FLAGS
• Code cleanup
• Don't force to refresh all zones when one zone is changed.
• Fix turning on the climate when we don't have a temperature.
• Remove obsolete convert_temperature's.
• Add fallback (bool) setting to indicate if tado has to fallback to a schedule or not.
• Log real error on 422 HTTP errors.

Documentation change: home-assistant/home-assistant.io#11497

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

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly. Update and include derived files by running python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt by running python3 -m script.gen_requirements_all.
• Untested files have been added to .coveragerc.

[MartinHjelmare]

Please split this PR into at least two PRs, one for the refactor and one to add the water_heater platform.

[michaelarnauts]

@MartinHjelmare

Okay, I will do this.

[michaelarnauts]

I'll put the water_heater back in a new PR.

[michaelarnauts]

@ejaviga could you take a look if your air conditioning is still working fine with these changes?

[michaelarnauts]

@MartinHjelmare is this okay for you? (I'm highlighting you since you've looked at this requests in the past).

When this gets merged, I can open the new PR for the water_heater.

[MartinHjelmare]

Sorry, I'm busy this week. I'll try to find some time.

[michaelarnauts]

I've modified the data flow like @balloob asked. Now, the component registers for the sensor updates, and stores them. It still uses the dispatcher to notify the platforms.

The platform will fetch the stored data the first time, and uses the dispatcher to be notified of updates.

[MartinHjelmare]

Awesome! 🎉