Implicitdict

Fix jsonschema treatment of bool fields

JSON Schema generation is added

With 7, data structures with non-primitive data types inside lists are treated more correctly.

With 6, StringBasedDateTime and StringBasedTimeDelta now behave more consistently and that behavior is better-defined.

With 5, implicitdict no longer attempts to serialize or deserialize class properties (implemented as methods). This harmonizes behavior with other `dict` subclasses.

ImplicitDict now processes types correctly with `from __future__ import annotations`.