Plugwise

- 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.

- Add support for getting and setting the lock-state of Plugs-, Circles-, Stealth-switches, for Adam and Stretch only. A set lock-state prevents a switch from being turned off.
- There is no lock_state available for the following special Plugwise classes: `central heating pump` and `value actuator`

- Functions not called by the plugwise(-beta) code have been moved to helper.py in which they are part of the subclass SmileHelper
- All for-loops are now executed only once, the results are stored in self-parameters.
- Added fw, model and vendor information into the output of get_device_data(), for future use in the HA Core Plugwise(-beta) Integration
- Split off HEATER_CENTRAL_MEASUREMENTS from DEVICE_MEASUREMENTS so they can be blocked when there is no Auxiliary device present
- Collect only the data from the Smile that is needed: full_update_device() for initialisation, update-device() for updating of live data
- Adapt test_smile.py to the new code, increase test-coverage further