Undictify

- Add support for PEP 563 (postponed evaluation of annotations)

- Add `type_checked_constructor` to preserve meta-information of classes

- cleaned up internal naming convention

- Documentation fix

- Documentation fix

- Simplify/unify API to only `type_checked_call` with parameters

breaking changes:

- `type_checked_call` becomes `type_checked_call()`
- `type_checked_call_skip` becomes `type_checked_call(skip=True)`
- `type_checked_call_convert` becomes `type_checked_call(convert=True)`
- `type_checked_call_skip_convert` becomes `type_checked_call(skip=True, convert=True)`

- `type_checked_apply(func, args)` becomes `type_checked_call()(func)(args)`
- `type_checked_apply_skip(func, args)` becomes `type_checked_call(skip=True)(func)(args)`
- `type_checked_apply_convert(func, args)` becomes `type_checked_call(convert=True)(func)(args)`
- `type_checked_apply_skip_convert(func, args)` becomes `type_checked_call(skip=True, convert=True)(func)(args)`