This adds the requirement of a void mayo for the Goblin Problem quest. There are also some small adjustments to related rules
- Fishing a void mayo is only considered an option during the Goblin Problem quest, as the odds of finding one after the quest drops drastically.
- Entrance to the witch hut now requires the goblin problem quest, not just a void mayo.
- Fishing rules are all moved to `fishing_logic.py`.
- `can_fish_at` no longer check that you have any of the fishing regions and the region you actually want to fish in.
- created `can_fish_anywhere` and `can_crab_pot_anywhere` to better illustrate when any fish satisfies the rule.
