Update QUEST_STAGE_DATA.h

feat: Add `Flags` to `QUEST_STAGE_DATA`.

Author: FalloutCascadia

include/RE/Q/QUEST_STAGE_DATA.h

@@ -5,9 +5,17 @@ namespace RE
 	class QUEST_STAGE_DATA
 	{
 	public:
+		enum class Flags
+		{
+			kDone = 0x1,
+			kStartUp = 0x2,
+			kShutDown = 0x4,
+			kKeepInstance = 0x8
+		};
+
 		// members
-		std::uint16_t index;  // 00
-		std::uint8_t  flags;  // 02
+		std::uint16_t 										index;  // 00
+		REX::EnumSet<QUEST_STAGE_DAGA::Flags, std::uint8_t> flags;  // 02
 	};
 	static_assert(sizeof(QUEST_STAGE_DATA) == 0x4);
-}
+}