A lot of interface stuff, some more cleanup and fixes. Main functionality should be mostly fine, importing works. Missing a lot of mod edit options.

Penumbra/Mods/Manager/Mod.Manager.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+
+namespace Penumbra.Mods;
+
+public sealed partial class Mod
+{
+    public sealed partial class Manager : IEnumerable< Mod >
+    {
+        private readonly List< Mod > _mods = new();
+
+        public Mod this[ Index idx ]
+            => _mods[ idx ];
+
+        public IReadOnlyList< Mod > Mods
+            => _mods;
+
+        public int Count
+            => _mods.Count;
+
+        public IEnumerator< Mod > GetEnumerator()
+            => _mods.GetEnumerator();
+
+        IEnumerator IEnumerable.GetEnumerator()
+            => GetEnumerator();
+
+        public Manager( string modDirectory )
+        {
+            SetBaseDirectory( modDirectory, true );
+            ModOptionChanged += OnModOptionChange;
+        }
+    }
+}