fix SMSG_ENCOUNTER_START / SMSG_ENCOUNTER_END for 12.0 (#984)

Author: Alica228

WowPacketParserModule.V10_0_0_46181/Parsers/InstanceHandler.cs

@@ -152,7 +152,10 @@ public static void HandleMultiFloorNewFloor(Packet packet)
         public static void HandleEncounterstart(Packet packet)
         {
             packet.ReadInt32("DungeonEncounterID");
-            packet.ReadInt32<DifficultyId>("DifficultyID");
+            if (ClientVersion.AddedInVersion(ClientVersionBuild.V12_0_0_65390))
+                packet.ReadInt16<DifficultyId>("DifficultyID");
+            else
+                packet.ReadInt32<DifficultyId>("DifficultyID");
             packet.ReadInt32("GroupSize");
             var count = packet.ReadUInt32();
 

WowPacketParserModule.V6_0_2_19033/Parsers/InstanceHandler.cs

@@ -208,7 +208,10 @@ public static void HandleEncounterStart(Packet packet)
         public static void HandleEncounterStop(Packet packet)
         {
             packet.ReadInt32("EncounterID");
-            packet.ReadInt32<DifficultyId>("DifficultyID");
+            if (ClientVersion.AddedInVersion(ClientVersionBuild.V12_0_0_65390))
+                packet.ReadInt16<DifficultyId>("DifficultyID");
+            else
+                packet.ReadInt32<DifficultyId>("DifficultyID");
             packet.ReadInt32("GroupSize");
             packet.ReadBit("Success");
         }