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/Mod.ChangedItems.cs

@@ -0,0 +1,23 @@
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Penumbra.Mods;
+
+public sealed partial class Mod
+{
+    public SortedList< string, object? > ChangedItems { get; } = new();
+    public string LowerChangedItemsString { get; private set; } = string.Empty;
+
+    public void ComputeChangedItems()
+    {
+        var identifier = GameData.GameData.GetIdentifier();
+        ChangedItems.Clear();
+        foreach( var gamePath in AllRedirects )
+        {
+            identifier.Identify( ChangedItems, gamePath.ToGamePath() );
+        }
+
+        // TODO: manipulations
+        LowerChangedItemsString = string.Join( "\0", ChangedItems.Keys.Select( k => k.ToLowerInvariant() ) );
+    }
+}