Return references instead of pointers from the config system.

We used to return NULL from these methods but now we return an empty
block so this can never actually be null now.

src/modulemanager.cpp

@@ -242,7 +242,7 @@ ModuleReturn ModuleManager::LoadModule(const Anope::string &modname, User *u)
 	/* Initialize config */
 	try
 	{
-		m->OnReload(Config);
+		m->OnReload(*Config);
 	}
 	catch (const ModuleException &ex)
 	{