Plugwise

- Stick: Add new properties `energy_consumption_today` counter and `energy_consumption_today_last_reset` timestamp. These properties can be used to properly measure the used energy. Very useful for the 'Energy' capabilities introduced in Home Assistant 2021.8
- Stick: Synchronize clock of all plugwise devices once a day
- Stick: Reduced local clock drift from 30 to 5 seconds
- Stick: Optimized retrieval and handling of energy history
- Smile: add the required sensor attributes for Energy support
- Smile: add last_reset timestamps for interval-sensors and cumulative sensors
- Smile: fix the unit_of_measurement of electrical-cumulative-sensors (Wh --> kWh)

- Smile: improve use of protection for functions and parameter
- Fix pylint warnings and errors

- Adam, Anna: don't show removed thermostats / thermostats without a location

- Rearrange data: the outputs of get_all_devices() and get_device_data() are combined into self.gw_devices. Binary_sensors, sensors and switches are included with all their attributes, in lists.
- Two classes have been added (entities.py), one for master_thermostats and one for binary_sensors, these classes now handle the processing of data previously done in plugwise-beta (climate.py and binary_sensor.py).

- Stick: make stick code run at python 3.9 (fixes AttributeError: 'Thread' object has no attribute 'isAlive')
- Smile: underlying code improvements (solve complexity, linting, etc.), continuing to improve on the changes implemented in v0.9.2.