@sjaeckel integrated clang-format with formal coding style. Run his
script and commit changes.
There are pros and cons of this commit.
Mixed coding style is a "broken window". A good single style simplifies
reading and writing code.
On the other hand, this is a big change which will lead to conflicts.
support in and out. It's easier for the build system if we do this
with #ifdef's but conditional compilation is easier while we're
playing around.
Also rename a function.
This adds a tls_t that looks a bit like a socket, but can turn
on and off tls. The idea would be to plug this into the xmpp_conn_t
and use it iff the connection is in TLS mode.
