Docs: Make an actual LogicMixin spec & explanation

[NewSoupVi]

No description provided.

[Exempt-Medic]

Two small comments

[Exempt-Medic]

LGTM

[ScipioWright]

LGTM, but also you told me about it in the first place so

[ScipioWright]

Suggested change

	Only use LogicMixin if necessary. There are often other ways to achieve what it does, like making clever use of
	`state.prog_items`, or using event items, pseudo-regions etc.
	Only use LogicMixin if necessary. There are often other ways to achieve what it does, like making clever use of
	`state.prog_items`, using event items, pseudo-regions, etc.

[NewSoupVi]

Hmmm, I guess it's fine, it does read better.
The reason I wrote it this way is because in my mind, these are two different "groups" of concepts

1. Accessing state data directly (state.prog_items, theoretically also stuff like state.reachable_regions or state.blocked_connections)
2. Using objects from the "normal" classes to express extra logic ("Pseudo" Regions, (Event) Items / Locations)

[ScipioWright]

At the very minimum you need to put the , before etc., or instead of etc. you could write out "or other things" or something like that, I think that would get your way of saying it across better.