* Add CONF_LOCATION constant
* Update all custom CONF_LOCATION definitions to point to constant
* remove CONF_LOCATION from homeassistant/components/totalconnect/const
* Add config flow to pi-hole
* Add config flow tests
* Change PlatformNotReady to ConfigEntryNotReady
* Improve config flow
* Add @shenxn as codeowner
* Use entity_id as unique id
* Remove .get with [] for required fields
* Remove unique id from config flow
* Replace some strings with references
* Fix api_key string
* Fix service api_key check
* Remove unused DuplicatedNameException