feat(SortByInternal): add sort2

SortByInternalDifficulty/MU3.DB/patch_MusicSort2IDEnum.cs

@@ -0,0 +1,15 @@
+using MonoMod;
+
+namespace MU3.DB;
+
+[MonoModPatch("global::MU3.DB.MusicSort2IDEnum")]
+public static class patch_MusicSort2IDEnum {
+    private static MusicSort2TableRecord[] records;
+    public static extern bool orig_loadFromFile(string filename);
+
+    public static bool loadFromFile(string filename) {
+        var rv = orig_loadFromFile(filename);
+        records[4].Name = "インターナル";
+        return rv;
+    }
+}