RTR#33 Further refactoring, ActivityPub module

Today a quick update - I'm continuing the refactoring and preparing new AP module. Mostly technical stuff. Tomorrow I'll be a bit less available as I need to take care of a few real-life matters related to the end of the year.

You can track changes in the official repository
https://codeberg.org/Kbin/kbin-core

or on Github
https://github.com/ernestwisniewski/kbin