Core/Movement: Implemented movement forces

Port From (https://github.com/TrinityCore/TrinityCore/commit/8e98ceb2936842ea0032cbfdc04a510d6b1e5de0)

Source/Game/Entities/Player/Player.Fields.cs

@@ -89,6 +89,7 @@ namespace Game.Entities
         //Movement
         public PlayerTaxi m_taxi = new PlayerTaxi();
         public byte[] m_forced_speed_changes = new byte[(int)UnitMoveType.Max];
+        public byte m_movementForceModMagnitudeChanges;
         uint m_lastFallTime;
         float m_lastFallZ;
         WorldLocation teleportDest;