WIP: Allow creating irc connections from Read+Write

[kpcyrd]

Resolves #162 (eventually)

I'm not sure how complete that implementation is at this point, since you know the codebase a lot better than I do you might be able to give some pointers.

So far it seems I can just ignore all options that are not relevant for me, but I'm wondering if it's possible to disable reconnects and handle them myself. A reconnect attempt would likely error out since config.server is None.

As a note, this is somewhat related to #151

[aatxe]

Hi @kpcyrd!

Thank you for the pull request, and I'm sorry for the delay in response! 😄

At first glance, this looks like it should work, but I'd like to see some more testing.

If possible, can you produce unit tests that use this new Generic connection type? You might be able to use Vec or something similar as a stream here, and then inspect it at the end (which is roughly how the Mock variant works). If not, I'd at least like to have an example program using it both for documentation purposes and sort of integration testing the implementation.