Implement AudioGroup macro type

UndertaleModLib/Decompiler/GlobalDecompileContext.cs

@@ -406,6 +406,12 @@
                     return null;
                 }
                 return $"{_instanceIdPrefix}{assetIndex}";
+            case AssetType.AudioGroup:
+                if (assetIndex >= (Data.AudioGroups?.Count ?? 0))
+                {
+                    return null;
+                }
+                return Data.AudioGroups[assetIndex]?.Name?.Content;
         }
 
         return null;

UndertaleModLib/GameSpecificData/Underanalyzer/gamemaker.json

@@ -780,6 +780,15 @@
       "audio_sound_get_gain": [ "Asset.Sound" ],
       "audio_play_sound_on": [ null, "Asset.Sound", "Bool", null ],
       "audio_play_in_sync_group": [ null, "Asset.Sound" ],
+      "audio_group_get_assets": [ "Asset.AudioGroup" ],
+      "audio_group_get_gain": [ "Asset.AudioGroup" ],
+      "audio_group_is_loaded": [ "Asset.AudioGroup" ],
+      "audio_group_load": [ "Asset.AudioGroup" ],
+      "audio_group_load_progress": [ "Asset.AudioGroup" ],
+      "audio_group_name": [ "Asset.AudioGroup" ],
+      "audio_group_set_gain": [ "Asset.AudioGroup", null, null ],
+      "audio_group_stop_all": [ "Asset.AudioGroup" ],
+      "audio_group_unload": [ "Asset.AudioGroup" ],
       "sound_exists": [ "Asset.Sound" ],
       "sound_get_name": [ "Asset.Sound" ],
       "sound_play": [ "Asset.Sound" ],

UndertaleModLib/Models/UndertaleCode.cs

@@ -1323,6 +1323,7 @@
                 AssetType.Object => 0,
                 AssetType.Sprite => 1,
                 AssetType.Sound => 2,
+                AssetType.AudioGroup => 2,
                 AssetType.Room => 3,
                 AssetType.Path => 4,
                 AssetType.Script => 5,
@@ -1343,6 +1344,7 @@
             AssetType.Object => 0,
             AssetType.Sprite => 1,
             AssetType.Sound => 2,
+            AssetType.AudioGroup => 2,
             AssetType.Room => 3,
             AssetType.Background => 4,
             AssetType.Path => 5,