Converts 0..255 values that HA expects into a device 0..SCALE value
Example:
HA considers "hall light" at 25 brightness or 10% of 255
Device considers "hall light" at 100 brightness or 10% of 1000
This allows our existing MQTT devices to not change their data format to be used in HA
* Move S_LIGHT and V_LIGHT from light back to switch platform, to avoid
double devices showing.
* Remove MySensorsLightPlain class from light platform, since it's not
needed anymore.
* A light switch with only a switch, ie no dimmer or
RGB controls, will show as a regular switch device.
* Add mysensors binary sensor.
* Add discovery platforms to binary_sensor base component.
* Replace device_state_attributes with state_attributes in
binary_sensor base class.
* Fix docstrings.
* Add discovery of binary sensor to mysensors component.
* Add child.type as argument to mysensors device_class.
* Move binary sensor types from sensor to binary_sensor module.
* Fix binary_sensor attribute tests. Use state_attributes instead of
device_state_attributes.
* Add check if V_LIGHT is in values before sending message in
_turn_on_light.
* Replace super calls with self.
* Remove not needed init method in child classes.
* Remove turn_on method in parent class and add update_ha_state
to _turn_on_light, _turn_on_dimmer and _turn_on_rgb_or_w.
* Make a flatter one level inheritance, with MySensorsLight as parent
with four children, one per light type.
* Break out helper methods. One per plain light, dimmer and RGB/RGBW
children and per update, turn_on and turn_off, nine in total. Put
these in the parent.
* Call the helper methods as needed from the child methods update,
turn_on and turn_off.
* Change name of MySensorsLightLight to MySensorsLightPlain.
* Fix module docstrings according to pep257.
* Change name of color util method from rgb_hex_to_list to
rgb_hex_to_rgb_list.
* Add unit tests for rgb_hex_to_rgb_list.
* Add a light entity class per V_LIGHT, V_DIMMER, V_RGB and V_RGBW.
Make these classes inherit each other up to MySensorsLight class.
* Map the entity classes to their S_TYPE in a dict.
* Check if an entity class map or just an entity class have been passed
to pf_callback_factory before using the entity_class variable in
homeassistant/components/mysensors.py.
* Add rgb_hex_to_list function in homeassistant/util/color.py.
* Make light controllable independently with types V_LIGHT, V_DIMMER,
V_RGB and V_RGBW. V_RGBW is not implemented in the frontend yet.
* Add discovery for light platform.
* Add optimistic mode config setting for switch and light
to allow feedback state from actuator.
* Move S_LIGHT, V_LIGHT, V_STATUS types from switch to light platform.
* Change node update logging to debug from info level.
* Fix some inaccurate comments.
* The application of the version check in unit_of_measurement was
messed up after the last refactor. Fix that again.
* An error could occur in device_state_attributes if there was a
mismatch between used value_type in the device and mysensors
version in config. Add try... except to handle that.
Bump pyvera version.
Bump pywemo version.
Add unavailable status before properly initialised for maker and insight.
