performance: Apply culling to tile entities and throttle PathNavigation::updatePath to run every 8 ticks

Cull tile entities and throttle mob pathfinding to every 8 ticks.
The players won't see the difference on the pathfinding and the culling improves the performance by a lot in zones with a lot of tile entities

in TileEntityRenderDispatcher.cpp:
Calculate if the tile entities are visible in the camera. Early return if they are so they don't get rendered while the players don't look at those tile entities so .
in PathNavigation.cpp:
Do a simple modulo operation on the current number of ticks to test if its been 8 ticks since last operation. UpdatePath(); doesn't get executed if elapsed time isn't enough

Minecraft.World/PathNavigation.cpp

@@ -149,12 +149,14 @@ Path *PathNavigation::getPath()
 	return path;
 }
 
-void PathNavigation::tick()
-{
-	++_tick;
-	if (isDone()) return;
+	void PathNavigation::tick()
+	{
+		++_tick;
+		if (isDone()) return;
 
-	if (canUpdatePath()) updatePath();
+		// Instead of calculating the path every tick, do it only once every 8 ticks
+		// Players won't see the difference
+		if (_tick % 8 == 0 && canUpdatePath()) updatePath();
 
 	if (isDone()) return;
 	Vec3 *target = path->currentPos(mob->shared_from_this());
@@ -384,4 +386,4 @@ bool PathNavigation::canWalkAbove(int startX, int startY, int startZ, int sx, in
 void PathNavigation::setLevel(Level *level)
 {
 	this->level = level;
-}
+}