* Type check all helpers, add inline exclusions for work in progress
* Remove unused Script._template_cache
* Add some missing type hints
* Remove unneeded type: ignore
* Type hint fixes
* Mypy assistance tweaks
* Don't look for None in deprecated config "at most once" check
* Avoid None name slugify attempt when generating entity id
* Avoid None state store attempt on entity remove
* Switch mailgun to use webhook api
* Generalize webhook_config_entry_flow
* Add tests for webhook_config_entry_flow
* Add tests for mailgun
* Remove old mailgun file from .coveragerc
* Refactor WebhookFlowHandler into config_entry_flow
* Remove test of helper func from IFTTT
* Lint
* Refactoring data_entry_flow and config_entry_flow
Move SOURCE_* to config_entries
Change data_entry_flow.FlowManager.async_init() source param default
to None
Change this first step_id as source or init if source is None
_BaseFlowManagerView pass in SOURCE_USER as default source
* First step of data entry flow decided by _async_create_flow() now
* Lint
* Change helpers.config_entry_flow.DiscoveryFlowHandler default step
* Change FlowManager.async_init source param to context dict param