Core/Common: Merge TimeTrackerSmall with TimeTracker

Port From (https://github.com/TrinityCore/TrinityCore/commit/8809d54ca2daa230b1439f012c8b10ee88d6beae)

Source/Game/Entities/Unit/Unit.Fields.cs

@@ -41,7 +41,7 @@ namespace Game.Entities
         public MoveSpline MoveSpline { get; set; }
         MotionMaster i_motionMaster;
         public uint m_movementCounter;       //< Incrementing counter used in movement packets
-        TimeTrackerSmall splineSyncTimer;
+        TimeTracker splineSyncTimer;
         MovementForces _movementForces;
         PositionUpdateInfo _positionUpdateInfo;
         protected Unit m_unitMovedByMe;    // only ever set for players, and only for direct client control

Source/Game/Entities/Unit/Unit.Movement.cs

@@ -1708,7 +1708,7 @@ namespace Game.Entities
 
             if (MoveSpline.IsCyclic())
             {
-                splineSyncTimer.Update((int)diff);
+                splineSyncTimer.Update(diff);
                 if (splineSyncTimer.Passed())
                 {
                     splineSyncTimer.Reset(5000); // Retail value, do not change

Source/Game/Entities/Unit/Unit.cs

@@ -87,7 +87,7 @@ namespace Game.Entities
 
             m_serverSideVisibility.SetValue(ServerSideVisibilityType.Ghost, GhostVisibilityType.Alive);
 
-            splineSyncTimer = new TimeTrackerSmall();
+            splineSyncTimer = new TimeTracker();
 
             m_unitData = new UnitData();
         }