Support Matrix Federation

Matrix is already extremely fragmented between clients and servers and lacks multiple core features that Fluxer already has. Fluxer trying to support Matrix would be, quite frankly, a wasted effort without far more effort on Matrix's side, which I would imagine they have zero interest in, considering both platforms have far different directions. It would be far more reasonable and realistic to make a matrix relay bot instead of trying to shoehorn compatibility into the base software.