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/Stat.h

@@ -57,5 +57,5 @@ public:
 
 public:
 	// 4J-JEV, for Durango stats
-	virtual void handleParamBlob(shared_ptr<LocalPlayer> plr, byteArray param) { app.DebugPrintf("'Stat.h', Unhandled AwardStat blob.\n"); return; }
+	virtual void handleParamBlob(std::shared_ptr<LocalPlayer> plr, byteArray param) { app.DebugPrintf("'Stat.h', Unhandled AwardStat blob.\n"); return; }
 };