Core/MMaps: Implemented a way to enable/disable certain terrain types for movement on the entire map

Port From (https://github.com/TrinityCore/TrinityCore/commit/da0ba86694010fcb1adb5ed88cbc212dd4a33ab5)

Source/Game/Maps/Map.cs

@@ -3211,6 +3211,17 @@ namespace Game.Maps
 
         public TerrainInfo GetTerrain() { return m_terrain; }
 
+        // custom PathGenerator include and exclude filter flags
+        // these modify what kind of terrain types are available in current instance
+        // for example this can be used to mark offmesh connections as enabled/disabled
+        public ushort GetForceEnabledNavMeshFilterFlags() { return m_forceEnabledNavMeshFilterFlags; }
+        public void SetForceEnabledNavMeshFilterFlag(ushort flag) { m_forceEnabledNavMeshFilterFlags |= flag; }
+        public void RemoveForceEnabledNavMeshFilterFlag(ushort flag) { m_forceEnabledNavMeshFilterFlags &= (ushort)~flag; }
+
+        public ushort GetForceDisabledNavMeshFilterFlags() { return m_forceDisabledNavMeshFilterFlags; }
+        public void SetForceDisabledNavMeshFilterFlag(ushort flag) { m_forceDisabledNavMeshFilterFlags |= flag; }
+        public void RemoveForceDisabledNavMeshFilterFlag(ushort flag) { m_forceDisabledNavMeshFilterFlags &= (ushort)~flag; }
+
         public uint GetInstanceId()
         {
             return i_InstanceId;
@@ -4672,6 +4683,8 @@ namespace Game.Maps
         protected List<WorldObject> m_activeNonPlayers = new();
         protected List<Player> m_activePlayers = new();
         TerrainInfo m_terrain;
+        ushort m_forceEnabledNavMeshFilterFlags;
+        ushort m_forceDisabledNavMeshFilterFlags;
 
         SortedMultiMap<long, ScriptAction> m_scriptSchedule = new();
 

Source/Game/Movement/Generators/PathGenerator.cs

@@ -868,6 +868,9 @@ namespace Game.Movement
 
         void UpdateFilter()
         {
+            _filter.setIncludeFlags((ushort)(_filter.getIncludeFlags() | _source.GetMap().GetForceEnabledNavMeshFilterFlags()));
+            _filter.setExcludeFlags((ushort)(_filter.getExcludeFlags() | _source.GetMap().GetForceDisabledNavMeshFilterFlags()));
+
             // allow creatures to cheat and use different movement types if they are moved
             // forcefully into terrain they can't normally move in
             Unit _sourceUnit = _source.ToUnit();