Core: Implement Location/Item Groups

[jeffreybardon]

What task needs to be completed?

Implementing location and item groups for meta-use. Stuff like being able to exclude_locations: Stadium Attack to automatically exclude all locations in that level, or start_hints: Gadgets to automatically hint all gadgets.

[Thedragon005]

Items groups that at minumum seems a good idea to implement : Gadgets : club,radar,sling,hoop,car,punch,flyer Keys: All 6 keys DimensionX : Stadium Attack and Gladiator Attack