This PR adds fixture files for:
- KH100 (UK), hardware 1.0, firmware 1.7.5
- KE100 (UK), hardware 1.0, firmware 2.15.0
- KE110 (EU), hardware 1.0, firmware 1.4.0
The fixtures were collected from physical devices and anonymized for use
in development and testing.
The KE110 fixture is a new device model and has been added to the
appropriate fixture category.
This also improves test suite by adding TRV state simulation to allow tests pass on fixtures that report a non-heating state.
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Co-authored-by: Teemu Rytilahti <tpr@iki.fi>
The `low_battery` state needs to be discarded before checking for an empty
list of states to avoid incorrect reporting when the battery is low and
there is no specific state set.
