Core/Units: Renamed unknown unit flag (UNIT_FLAG_UNK_29 -> UNIT_FLAG_PREVENT_EMOTES_FROM_CHAT_TEXT)

Port From (https://github.com/TrinityCore/TrinityCore/commit/fc456f7512b3a5f1f5fdc5b17877018892070e4d)

Source/Framework/Constants/CreatureConst.cs

@@ -77,7 +77,7 @@ namespace Framework.Constants
         Skinnable = 0x4000000,
         Mount = 0x8000000,
         Unk28 = 0x10000000,
-        Unk29 = 0x20000000,
+        PreventEmotesFromChatText = 0x20000000, // Prevent automatically playing emotes from parsing chat text, for example "lol" in /say, ending message with ? or !, or using /yell
         Sheathe = 0x40000000,
         Immune = 0x80000000
     }

Source/Game/Spells/Auras/AuraEffect.cs

@@ -1689,7 +1689,7 @@ namespace Game.Spells
                 if (aurApp.HasRemoveMode())
                     return;
 
-                target.AddUnitFlag(UnitFlags.Unk29);
+                target.AddUnitFlag(UnitFlags.PreventEmotesFromChatText);
                 target.AddUnitFlag2(UnitFlags2.FeignDeath);
                 target.AddDynamicFlag(UnitDynFlags.Dead);
                 target.AddUnitState(UnitState.Died);
@@ -1700,7 +1700,7 @@ namespace Game.Spells
             }
             else
             {
-                target.RemoveUnitFlag(UnitFlags.Unk29);
+                target.RemoveUnitFlag(UnitFlags.PreventEmotesFromChatText);
                 target.RemoveUnitFlag2(UnitFlags2.FeignDeath);
                 target.RemoveDynamicFlag(UnitDynFlags.Dead);
                 target.ClearUnitState(UnitState.Died);