Some reverse proxies have bugs or a misconfigured and return
uncompressed bodies with a compression header (i.e. some versions of
caddy, if you enable compression in synapse). This prevents nheko
breaking in those cases.

Add methods for SAS

Online key backup

This is needed for openssl 1.1. Sadly this breaks json_fwd.hpp
detection, so it was removed (for now at least).

Still causing MAC errors

This should fix #171

This should fix #171

Adds function to set presence explicitly, query presence explicitly and
to set presence explicitly on sync as well as receive presence updates.