New client implemtation !

[janiversen]

Well not totally, but the async client have had a major shakeup.

In the old version, the app created a client object, and the client create a protocol object (identical to the client object), which made performance and debug not exactly light 👎

The new version the protocol object is removed and connections / data handling / exception are all done directly in the client object. There are still a lot of cleanup to do, which will be done over the next couple of weeks.

The code is available on dev, and is intended to be release as version 3.2.0 beginning of march.

Thanks in advance to people helping ironing out the remaining bugs.