Value copy / allocation optimizations mostly in server, SAO and serialize code

src/server/serverinventorymgr.h

@@ -57,4 +57,4 @@ class ServerInventoryManager : public InventoryManager
 	ServerEnvironment *m_env = nullptr;
 
 	std::unordered_map<std::string, DetachedInventory> m_detached_inventories;
-};
+};