WIP: Mqtts

This MR adds support for the mqtts protocol while retaining compability with specifying only the mqtt host.

This MR will restructure the repo quite a bit, maybe we should talk about this a little more.

Depends on !13 (closed). It should be explicitly merged before this one, as this MR will merge it implicitly.

Examples are still missing, because the structure for examples is quite unclear at the moment (see #3).