Core/vmaps: Stop worldserver startup when gameobject models cannot be loaded

Port From (https://github.com/TrinityCore/TrinityCore/commit/a2ec80b14ced0d32e5929af6286667de63e9d0ae)

Source/Game/Collision/Models/GameObjectModel.cs

@@ -225,14 +225,14 @@ namespace Game.Collision
         public bool IsMapObject() { return isWmo; }
         public byte GetNameSetId() { return owner.GetNameSetId(); }
         
-        public static void LoadGameObjectModelList()
+        public static bool LoadGameObjectModelList()
         {
             uint oldMSTime = Time.GetMSTime();
             var filename = Global.WorldMgr.GetDataPath() + "/vmaps/GameObjectModels.dtree";
             if (!File.Exists(filename))
             {
                 Log.outWarn(LogFilter.Server, "Unable to open '{0}' file.", filename);
-                return;
+                return false;
             }
             try
             {
@@ -241,7 +241,7 @@ namespace Game.Collision
                 if (magic != MapConst.VMapMagic)
                 {
                     Log.outError(LogFilter.Misc, $"File '{filename}' has wrong header, expected {MapConst.VMapMagic}.");
-                    return;
+                    return false;
                 }
 
                 long length = reader.BaseStream.Length;
@@ -266,6 +266,7 @@ namespace Game.Collision
             }
 
             Log.outInfo(LogFilter.ServerLoading, "Loaded {0} GameObject models in {1} ms", StaticModelList.models.Count, Time.GetMSTimeDiffToNow(oldMSTime));
+            return true;
         }
 
         bool _collisionEnabled;

Source/Game/World/WorldManager.cs

@@ -410,7 +410,7 @@ namespace Game
                 || !TerrainManager.ExistMapAndVMap(1, 10311.3f, 832.463f) || !TerrainManager.ExistMapAndVMap(1, -2917.58f, -257.98f)
                 || (WorldConfig.GetIntValue(WorldCfg.Expansion) != 0 && (!TerrainManager.ExistMapAndVMap(530, 10349.6f, -6357.29f) || !TerrainManager.ExistMapAndVMap(530, -3961.64f, -13931.2f))))
             {
-                Log.outError(LogFilter.ServerLoading, "Unable to load critical files - server shutting down !!!");
+                Log.outError(LogFilter.ServerLoading, "Unable to load map and vmap data for starting zones - server shutting down!");
                 Environment.Exit(1);
             }
 
@@ -508,6 +508,11 @@ namespace Game
 
             Log.outInfo(LogFilter.ServerLoading, "Loading GameObject models...");
             GameObjectModel.LoadGameObjectModelList();
+            if (!GameObjectModel.LoadGameObjectModelList())
+            {
+                Log.outFatal(LogFilter.ServerLoading, "Unable to load gameobject models, objects using WMO models will crash the client - server shutting down!");                
+                ShutdownServ(0, ShutdownMask.Force, ShutdownExitCode.Shutdown);
+            }
 
             Log.outInfo(LogFilter.ServerLoading, "Loading Instance Template...");
             Global.ObjectMgr.LoadInstanceTemplate();