Support Matrix Federation

In my opinion it makes more sense to just develop a new client that looks like fluxer but operates on the matrix protocol. Fluxer and Matrix under the hood are operationally very different, having to build an adapter for it sounds like a lot of issues especially in how sync would work. I think Fluxer should focus primarily on getting itself to a stable point. Matrix's approach also has problems that are well documented here: Why not matrix? And given the issues, it's understandable why many would not want to federate with Matrix.