Enhance error reporting on Twitch main module

Whenever there is an unconventional situation, Twitch's main module doesn't have a fully safe-proof way of handling it. Right now many things require manual work step-by-step (this already happened and was hacky-fixed on 836d5199). But, other parts (ex. joining an IRC Channel or loading Commands) can fail and might leave traces behind which require additional cleanup.

Rework this code to be more robust and have a better way of handling iffy situations.

Start by inspecting Twitch's main module and commit 836d5199 to understand the existing workaround. Trace failures while joining an IRC channel and loading Commands, including any cleanup that follows. Done means unconventional failures are handled safely without leaving traces or requiring manual step-by-step cleanup.

Written by the indexing model from the issue text.