fix(Core/Grid): Address bugs and performance issues introduced by visibility notifier implementation (#17480)

* Bug fixes

- Corrected std::chrono from seconds to milliseconds
- Got rid of leftover code that caused objects to not show up on time

* Removed logic to set gameobject as active

- More alignement with TC.
- Reduces CPU usage drastically

* Revert back to using time_t instead of std chrono

* Invoke SetNoCreate() method to reduce CPU usage drastically

* Remove setActive from static and motion transports

* Fix performance issues

* Added SetFarVisible to WG and some dungeon scripts

- Also removed setActive(true) from creatures in Wintergrasp. As for gameobjects they are set to active upon being damaged/destroyed and removed from active on rebuild (reset)

* Removed comments related to VISIBILITY_COMPENSATION

* Fix log

* Deleted unused files + corrected a check

* Added missing header

* Removed unused parameter

* Removed another unsued parameter

* Changed vector to set for i_visibleNow

- Changed vector to set for i_visibleNow in VisibleNotifer
- Adjusted HaveAtClient to accept Object*
- Adjusted SendUpdateToPlayer to send createobject packet only if not known to client

src/server/game/Movement/Spline/MovementPacketBuilder.h

@@ -38,6 +38,7 @@ namespace Movement
         static void WriteMonsterMove(const MoveSpline& mov, ByteBuffer& data);
         static void WriteStopMovement(Vector3 const& loc, uint32 splineId, ByteBuffer& data);
         static void WriteCreate(const MoveSpline& mov, ByteBuffer& data);
+        static void WriteSplineSync(MoveSpline const& mov, ByteBuffer& data);
     };
 }
 #endif // AC_PACKET_BUILDER_H