Options: implement progression balancing and accessibility on new system
Options: implement the notion of "common" and "per_game_common" options in various systems
Options: centralize item and location name checking
Spoiler: prettier print some lists, sets and dicts
WebHost: add common options into /templates
LttP: move glitch_boots to new options system
WebHost: options.yaml no longer lists aliases
General: remove region.can_fill, it was only used as a hack to make dungeon-specific items to work