thread-safe asyncio-aware queue for Python

 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.