rewrite

ShellyPy was originally written quite hastily without the expectation of API revisions or similar.

The idea afterwards was to write a C library for which Python bindings could be written that abstract the concepts, but the inconsistencies of the Gen 1 API have drowned any desire to actually implement that.

Now ShellyPy has developed a bit of cruft based on assumptions that are no longer true or were never true to begin with.

Rewriting the entire library from scratch with support for multiple different backends (direct http, mqtt, CoIoT, cloud) may be better than piling ontop of an already unstable foundation.