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/SheepFurModel.h

@@ -8,6 +8,6 @@ private:
 public:
 	SheepFurModel();
 
-	virtual void prepareMobModel(shared_ptr<Mob> mob, float time, float r, float a);
+	virtual void prepareMobModel(std::shared_ptr<Mob> mob, float time, float r, float a);
 	virtual void setupAnim(float time, float r, float bob, float yRot, float xRot, float scale, unsigned int uiBitmaskOverrideAnim=0);
 };