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>

documentation/en/releases.md

@@ -2,6 +2,9 @@
 
 ![New](images/new-icon.png)
 
+> * **Release 7.1**:
+>   - Redesign of the load-shedding function (power management). Load-shedding is now handled centrally (previously, each _VTherm_ was autonomous). This allows for much more efficient management and prioritization of load-shedding on devices that are close to the setpoint. Note that you must have a centralized configuration with power management enabled for this to work. More info [here](./feature-power.md).
+
 > * **Release 6.8**:
 >   - Added a new regulation method for `over_climate` type Versatile Thermostats. This method, called 'Direct Valve Control', allows direct control of a TRV valve and possibly an offset to calibrate the internal thermometer of your TRV. This new method has been tested with Sonoff TRVZB and extended to other TRV types where the valve can be directly controlled via `number` entities. More information [here](over-climate.md#lauto-régulation) and [here](self-regulation.md#auto-régulation-par-contrôle-direct-de-la-vanne).