Implements marking opponents as seen.

src/Battling/Models/Battle.hpp

@@ -64,6 +64,8 @@ namespace CreatureLib::Battling {
         void ValidateBattleState();
         inline bool HasEnded() const { return _hasEnded; }
         inline uint8_t GetResult() const { return _battleResult; }
+
+        const std::vector<BattleSide*>& GetSides() const { return _sides; }
     };
 }