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/DefaultRenderer.cpp

@@ -2,7 +2,7 @@
 #include "DefaultRenderer.h"
 #include "..\Minecraft.World\net.minecraft.world.entity.h"
 
-void DefaultRenderer::render(shared_ptr<Entity> entity, double x, double y, double z, float rot, float a)
+void DefaultRenderer::render(std::shared_ptr<Entity> entity, double x, double y, double z, float rot, float a)
 {
     glPushMatrix();
 // 4J - removed following line as doesn't really make any sense