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/DirtyChunkSorter.h

@@ -2,13 +2,13 @@
 class Chunk;
 class Mob;
 
-class DirtyChunkSorter : public std::binary_function<const Chunk *,const Chunk *,bool> 
+class DirtyChunkSorter : public std::binary_function<const Chunk *,const Chunk *,bool>
 {
 private:
-	shared_ptr<Mob> cameraEntity;
+	std::shared_ptr<Mob> cameraEntity;
 	int playerIndex; // 4J added
 
 public:
-    DirtyChunkSorter(shared_ptr<Mob> cameraEntity, int playerIndex);	// 4J - added player index
+    DirtyChunkSorter(std::shared_ptr<Mob> cameraEntity, int playerIndex);	// 4J - added player index
 	bool operator()(const Chunk *a, const Chunk *b) const;
 };