Core/GameObject: Implement GameObject::Use case for GAMEOBJECT_TYPE_NEW_FLAG

Port From (https://github.com/TrinityCore/TrinityCore/commit/2a9940e17d4e943aa5d9b95f8f5b54783e14d7b2)

Source/Game/Entities/GameObject/GameObject.cs

@@ -2005,6 +2005,18 @@ namespace Game.Entities
                     player.SetStandState((UnitStandStateType.SitLowChair + (byte)info.BarberChair.chairheight), info.BarberChair.SitAnimKit);
                     return;
                 }
+                case GameObjectTypes.NewFlag:
+                {
+                    GameObjectTemplate info = GetGoInfo();
+                    if (info == null)
+                        return;
+
+                    if (!user.IsPlayer())
+                        return;
+
+                    spellId = info.NewFlag.pickupSpell;
+                    break;
+                }
                 case GameObjectTypes.ItemForge:
                 {
                     GameObjectTemplate info = GetGoInfo();

Source/Game/Spells/SpellEffects.cs

@@ -1343,6 +1343,11 @@ namespace Game.Spells
                         return;
                     }
                 }
+                else if (goInfo.type == GameObjectTypes.NewFlag)
+                {
+                    gameObjTarget.Use(player);
+                    return;
+                }
                 else if (m_spellInfo.Id == 1842 && gameObjTarget.GetGoInfo().type == GameObjectTypes.Trap && gameObjTarget.GetOwner() != null)
                 {
                     gameObjTarget.SetLootState(LootState.JustDeactivated);