Asyncio adapter?

[goodboy]

As per some work I've been doing with QT in pikers/piker#52 (particularly to do with using quamash) I would like to see what can be whipped up for interacting with a foreign trio loop in another actor/process by running asyncio in a thread alongside a local actor.

Some things to check out:

• this universal queue
• the discussion surrounding trio-QT integration