Core/Config: Refactored ConfigMgr

* Loading initial configuration files is now separate from loading any additional custom configs

src/server/worldserver/CommandLine/CliRunnable.cpp

@@ -141,7 +141,7 @@ void CliRunnable::run()
     rl_event_hook = cli_hook_func;
 #endif
 
-    if (ConfigMgr::GetBoolDefault("BeepAtStart", true))
+    if (sConfigMgr->GetBoolDefault("BeepAtStart", true))
         printf("\a");                                       // \a = Alert
 
     // print this here the first time