Implement User Config System

[JakenVeina]

That is, per-guild config to be controlled by guild admins, rather than application admins.

Stored in the database? Or per-guild JSON files? Or per-feature JSON files? Regardless, it should probably feed into the Microsoft config system.

Probably do not want a Web Client UI for this system, as features that need config should definitely remain as independent as possible. Features that want a Web Client UI for config can implement them, individually.