Tools/vmap_assembler: Organize vmap files into directory-per-map

Port From (https://github.com/TrinityCore/TrinityCore/commit/518fe1fd1ecf107e11336c4a41ed90405b115dc0)

Source/Framework/Constants/MapConst.cs

@@ -56,7 +56,7 @@ namespace Framework.Constants
         public const uint mmapMagic = 0x4D4D4150; // 'MMAP'
         public const int mmapVersion = 15;
 
-        public const string VMapMagic = "VMAP_4.C";
+        public const string VMapMagic = "VMAP_4.D";
         public const float VMAPInvalidHeightValue = -200000.0f;
 
         public const uint MaxDungeonEncountersPerBoss = 4;

Source/Game/Collision/Management/VMapManager.cs

@@ -249,7 +249,7 @@ namespace Game.Collision
 
         public static string GetMapFileName(uint mapId)
         {
-            return $"{mapId:D4}.vmtree";
+            return $"{mapId:D4}/{mapId:D4}.vmtree";
         }
 
         public void SetEnableLineOfSightCalc(bool pVal) { _enableLineOfSightCalc = pVal; }

Source/Game/Collision/Maps/MapTree.cs

@@ -259,7 +259,7 @@ namespace Game.Collision
 
         public static string GetTileFileName(uint mapID, int tileX, int tileY, string extension)
         {
-            return $"{mapID:D4}_{tileY:D2}_{tileX:D2}.{extension}";
+            return $"{mapID:D4}/{mapID:D4}_{tileY:D2}_{tileX:D2}.{extension}";
         }
 
         public bool GetLocationInfo(Vector3 pos, LocationInfo info)