Issue_766-enhance_power_management (#778)

* First implem + tests (not finished)

* With tests of calculate_shedding ok

* Commit for rebase

* All tests ok for central_feature_power_manager

* All tests not ok

* All tests ok

* integrattion tests - Do startup works

* enhance the overpowering algo if current_power > max_power

* Change shedding calculation delay to 20 sec (vs 60 sec)

* Integration tests ok

* Fix overpowering is set even if other heater have on_percent = 0

* Fix too much shedding in over_climate

* Add logs

* Add temporal filter for calculate_shedding
Add restore overpowering state at startup

* Fix restore overpowering_state

* Removes poweer_entity_id from vtherm non central config

* Release

* Add Sonoff TRVZB in creation.md

* Add comment on Sonoff TRVZB Closing degree

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Co-authored-by: Jean-Marc Collin <jean-marc.collin-extern@renault.com>

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