Added terrain tag 17 NoEffect, Terrain Tag Editor now only sets defined terrain tags, fixed some move effects, fixed opposing Shadow Pokémon going into Hyper Mode, fixed Shadow Pokémon nature visibility

Data/Scripts/011_Battle/002_Move/001_PokeBattle_Move.rb

@@ -91,6 +91,8 @@ class PokeBattle_Move
   def damagingMove?; return @category!=2; end
   def statusMove?;   return @category==2; end
 
+  def pbPriority(user); return @priority; end
+
   def usableWhenAsleep?;    return false; end
   def unusableInGravity?;   return false; end
   def healingMove?;         return false; end