* Fix regression in MQTT discovery

* Update test

* Make color_name_to_rgb return a tuple

* Tweak

* Tweak

* Update test

* Tweak test

Co-authored-by: J. Nick Koston <nick@koston.org>

Co-authored-by: Markus Bong <2Fake1987@gmail.com>
Co-authored-by: Markus Bong <Markus.Bong@devolo.de>

Co-authored-by: Martin Hjelmare <marhje52@gmail.com>

Co-authored-by: epenet <epenet@users.noreply.github.com>

Co-authored-by: epenet <epenet@users.noreply.github.com>

* Add entity category 'hidden'

* Update cloud

* Update Google assistant

* Update Alexa

* Fix tests

* Add ENTITY_CATEGORIES constant

* Rename ENTITY_CATEGORY_HIDDEN to ENTITY_CATEGORY_SYSTEM

* Correct import in motioneye

* Allow configuration_url to be removed from device registry

* Add test

* Check for None before stringifying and url parsing

* Add type to dict to remove mypy error on assigning None

* Avoid service call in MQTT async_publish function

* Tweak

* Fix integrations + tests

Co-authored-by: jan iversen <jancasacondor@gmail.com>

Co-authored-by: epenet <epenet@users.noreply.github.com>

* Add kWh as cost option for GAS

* Add kWh as cost option for GAS (pylint)

* Add kWh as cost option for GAS (make CONST)

* Change GAS_UNITS to VALID_ENERGY_UNITS

* Add test for Gas cost in kWh (2)

* Back off ENERGY_WATT_HOUR - unlikely for gas

* Add MEGA_WATT_HOUR support (2)

* Normalise pricing for MEGA_WATT_HOUR

* Normalise pricing for MEGA_WATT_HOUR

Co-authored-by: Erik Montnemery <erik@montnemery.com>

Co-authored-by: epenet <epenet@users.noreply.github.com>

Co-authored-by: epenet <epenet@users.noreply.github.com>