* added utf-8 markers to all .py files in plugins/filter
* added utf-8 markers to all .py files in plugins/inventory
* added utf-8 markers to all .py files in plugins/lookup
* callback_type -> type.
* Mark authors as unknown.
* Add author field forgotten in #627.
* Fix author entries.
* Add author field forgotten in #127.
* Fix some types.
* Fix deprecation of callables.
* Fix various sanity errors.
* Revert callback_type -> type transform.
* Fix stat_result times: these are float according to https://github.com/python/typeshed/blob/master/stdlib/3/os/__init__.pyi
* Apply suggestions from code review
Co-authored-by: Andrew Klychkov <aaklychkov@mail.ru>
Co-authored-by: Andrew Klychkov <aaklychkov@mail.ru>