Updated regions.yml to model new format idea.

The configuration should define effect permission as follows:

no-potion-effect-regions:
    region1:
        deny-effects:
          'FIRE_RESISTANCE'
          'INVISIBILITY'
    region2:
        deny-effects:
          'SWIFTNESS'
          'HUNGER'

and so on, for each region.
It is essentially a blacklist, sorted by region.