shared_ptr -> std::shared_ptr

This is one of the first commits in a plan to remove all `using namespace std;` lines in the entire codebase as it is considered anti-pattern today.

Minecraft.World/OcelotSitOnTileGoal.cpp

@@ -107,7 +107,7 @@ bool OcelotSitOnTileGoal::isValidTarget(Level *level, int x, int y, int z)
 
 	if (tile == Tile::chest_Id)
 	{
-		shared_ptr<ChestTileEntity> chest = dynamic_pointer_cast<ChestTileEntity>(level->getTileEntity(x, y, z));
+		std::shared_ptr<ChestTileEntity> chest = dynamic_pointer_cast<ChestTileEntity>(level->getTileEntity(x, y, z));
 
 		if (chest->openCount < 1)
 		{