Summary: Mixed sync-async queue to interoperate between asyncio tasks and classic threads

Description:
Mixed sync-async queue, supposed to be used for communicating between classic
synchronous (threaded) code and asynchronous (in terms of asyncio) one.

Like Janus god the queue object from the library has two faces: synchronous and
asynchronous interface.

Synchronous is fully compatible with standard queue, asynchronous one follows
asyncio queue design.

Maintainer: nobody