* Add effect support to MQTT Light
* Use effect state topic for supported_features
* Dont use rainbow as default color
* Add color_temp support to MQTT JSON Light
* Add effect to MQTT JSON light
* Support lights in MQTT discovery
* Allow discovered devices to set their platform
* Add white value support to MQTT Light
* Add white value support to MQTT JSON Light
* Remove blank line
* Add color_temp support to MQTT Template light
* Add white value support to MQTT Template Light
* Remove unused SUPPORT_MQTT_TEMPLATE and stale unused flash and transition code from MQTT Template
* Add XY Color to MQTT Light Platform
* Fix syntax
* Fix more syntax errors
* Revert "Remove unused SUPPORT_MQTT_TEMPLATE and stale unused flash and transition code from MQTT Template"
This reverts commit c03798cb63.
* MQTT Template supports flash and transition but doesnt allow templating of the values
* Add XY color support to MQTT JSON
* Proper variable names
* Only allow whitelisted MQTT platforms to be loaded via MQTT Discovery
* Minor tweaks.
* Add support for light effects
* Move PLATFORM_SCHEMA changes in light to mqtt_template
* Add effect validation
* Add unittests
* Add light effect to demo and unittests
* Use cv.string for config validation
* Use cv.ensure_list for config validation
* Fix typo
* Remove unused exception management for effect