Bring in AAC!

project ive been working on for a while, just felt confident enough to move it here

AAC/AACCore/Editor/LayerGroup.cs

@@ -0,0 +1,31 @@
+using System.Collections.Generic;
+using nadena.dev.ndmf;
+
+namespace gay.lilyy.aaccore {
+    public abstract class LayerGroup
+    {
+        public virtual bool enabled { get { return true; } }
+        public virtual bool experimental { get { return false; } }
+        private V5AACLayerGroupLogger _logger;
+
+        
+        protected V5AACLayerGroupLogger Logger => _logger ??= new V5AACLayerGroupLogger(SystemName);
+        
+        private static readonly List<LayerGroup> instances = new();
+
+        protected LayerGroup() => instances.Add(this);
+
+        public static IEnumerable<LayerGroup> Instances => instances;
+
+        public virtual bool shouldWarnIfNotApplicable => true;
+        public virtual BuildPhase buildPhase => BuildPhase.Generating;
+        
+        public virtual bool IsApplicable(AACAssets assets) {
+            return true;
+        }
+        public abstract string DisplayName { get; }
+        public abstract string SystemName { get; }
+
+        public abstract void Run(AACAssets assets);
+    }
+}