[WIP] ACP Module

I doubt we will need this (or separate add and edit methods either)? Since there is so little data to set, basically just a few select boxes, checkboxes and numbers, I would focus on a simpler approach. Editing and adding will probably be the same thing, so maybe there just needs to be one method: save_autougroup_rule. But I don't know, we'll see what you come up with. :rabbit: