Am43 improvements pt3

[andrey-yantsen]

Description

I built this PR on top of #233, to reduce conflicts during the merge. I decided to make it a separate PR because the timer-related changes are extremely ugly implemented. At least in terms of HomeAssistant autodiscovery.

I'm open to ideas, how to make it better :)

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

[zewelor]

Is it ready to review ? Please rebase on master, to reduce code size to review.

[andrey-yantsen]

@zewelor yup, it's ready. Using this code in my house for the 2nd day :D Rebased on master, please take a look.

[zewelor]

Nice ! LGTM