* Add support for limited templates (no HASS access)
* Pass variables to automation triggers
* Support templates in MQTT triggers
* Spelling
* Handle trigger referenced by variables
* Raise on unsupported function in limited templates
* Validate MQTT trigger schema in MQTT device trigger
* Add trigger_variables to automation config schema
* Don't print stacktrace when setting up trigger throws
* Make pylint happy
* Add trigger_variables to variables
* Add debug prints, document limited template
* Add tests
* Validate MQTT trigger topic early when possible
* Improve valid_subscribe_topic_template
