Fix `TAbstractMessage.Send` to work with the main loop

[genericptr]

From Michael:

The send method seems OK, but IMO it conflicts with the main loop logic since it
sends directly to stdout. e.g. In case of threading, this will go wrong horribly.

I have restructured the sending/listening code locally, so I will look at
resolving this later...

So yes please, make an issue for this...