Core/Movement: Corrected Animation Tier handling

Port From (https://github.com/TrinityCore/TrinityCore/commit/ee620856ad2918ae7ce91a37a980d9f2129a074a)

Source/Framework/Constants/Movement/MovementConst.cs

@@ -120,14 +120,6 @@ namespace Framework.Constants
         public const uint SmartEscortLastOCCPoint = 0xFFFFFF;
     }
 
-    public enum AnimType
-    {
-        ToGround = 0, // 460 = ToGround, index of AnimationData.dbc
-        FlyToFly = 1, // 461 = FlyToFly?
-        ToFly = 2, // 458 = ToFly
-        FlyToGround = 3  // 463 = FlyToGround
-    }
-
     public enum RotateDirection
     {
         Left,

Source/Framework/Constants/UnitConst.cs

@@ -277,13 +277,13 @@ namespace Framework.Constants
         All = 0xFF
     }
 
-    public enum UnitBytes1Flags
+    public enum AnimTier
     {
-        None = 0x00,
-        AlwaysStand = 0x01,
-        Hover = 0x02,
-        Unk3 = 0x04,
-        All = 0xFF
+        Ground = 0, // plays ground tier animations
+        Swim = 1, // falls back to ground tier animations, not handled by the client, should never appear in sniffs, will prevent tier change animations from playing correctly if used
+        Hover = 2, // plays flying tier animations or falls back to ground tier animations, automatically enables hover clientside when entering visibility with this value
+        Fly = 3, // plays flying tier animations
+        Submerged = 4
     }
 
     public enum UnitPVPStateFlags