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.Client/Common/Tutorial/UseTileTask.cpp

@@ -25,7 +25,7 @@ bool UseTileTask::isCompleted()
 	return bIsCompleted;
 }
 
-void UseTileTask::useItemOn(Level *level, shared_ptr<ItemInstance> item, int x, int y, int z,bool bTestUseOnly)
+void UseTileTask::useItemOn(Level *level, std::shared_ptr<ItemInstance> item, int x, int y, int z,bool bTestUseOnly)
 {
 	if(bTestUseOnly) return;