Thermostat over climate and configuration enhancements

This second major release is composed of the following enhancements:

1. Add a thermostat over a climate mode in addition to the thermostat over switch mode #5
2. Suggest/select entity in a list on the configuration screens #16
3. Simplify the configuration by adding a checkbox for feature which should be configured #21
4. Rework: simplify the entity update when config have change #26

And the following bug fixes:

1. If temperture is stable, the heater goes in security mode even if the heating percent is low #30
2. Error with Fan Modes on thermostat over climate type #32
3. Error at initialisation #36
4. Failure to initialize #39
5. Some switch are not visible in the list of radiators #40

Enjoy !