Adds functions to add, remove, and get volatile scripts from a BattleSide.

Signed-off-by: Deukhoofd <Deukhoofd@gmail.com>

src/Battling/Models/Battle.hpp

@@ -88,6 +88,7 @@ namespace CreatureLib::Battling {
         ArbUt::OptionalBorrowedPtr<BattleParty> FindPartyForCreature(const ArbUt::BorrowedPtr<Creature>&);
 
         const ArbUt::UniquePtrList<BattleSide>& GetSides() const noexcept { return _sides; }
+
         ArbUt::OptionalBorrowedPtr<BattleScript> GetVolatileScript(const ArbUt::StringView& key) const {
             return _volatile.Get(key);
         }