Add interface for revised savefile types (patches)

SWSH is the first common savefile type that has different revisions after official patches. We want to indicate in the Program Title which revision we're currently editing, because people still are not editing latest-format saves and complaining y no urshifu.

Use short descriptions to indicate revision (Base, IoA, CT), rather than magic numbers (v0/v1) or 1.X or 1.X.Y+, because GameFreak can't follow semver rules.

go away ranch platinum update, i might handle you another time

PKHeX.Core/Saves/SAV8SWSH.cs

@@ -7,7 +7,7 @@ namespace PKHeX.Core
     /// <summary>
     /// Generation 8 <see cref="SaveFile"/> object for <see cref="GameVersion.SWSH"/> games.
     /// </summary>
-    public sealed class SAV8SWSH : SAV8, ISaveBlock8SWSH, ITrainerStatRecord
+    public sealed class SAV8SWSH : SAV8, ISaveBlock8SWSH, ITrainerStatRecord, ISaveFileRevision
     {
         public SAV8SWSH(byte[] data) : this(data, SwishCrypto.Decrypt(data))
         {
@@ -18,6 +18,7 @@ namespace PKHeX.Core
             Data = Array.Empty<byte>();
             AllBlocks = blocks;
             Blocks = new SaveBlockAccessor8SWSH(this);
+            SaveRevision = Zukan.GetRevision();
             Initialize();
         }
 
@@ -25,6 +26,7 @@ namespace PKHeX.Core
         {
             AllBlocks = Meta8.GetBlankDataSWSH();
             Blocks = new SaveBlockAccessor8SWSH(this);
+            SaveRevision = Zukan.GetRevision();
             Initialize();
             ClearBoxes();
         }
@@ -40,6 +42,16 @@ namespace PKHeX.Core
             Edited = true;
         }
 
+        public int SaveRevision { get; }
+
+        public string SaveRevisionString => SaveRevision switch
+        {
+            0 => "-Base", // Vanilla
+            1 => "-IoA", // DLC 1: Isle of Armor
+            2 => "-CT", // DLC 2: Crown Tundra
+            _ => throw new ArgumentOutOfRangeException(nameof(SaveRevision)),
+        };
+
         public IReadOnlyList<SCBlock> AllBlocks { get; }
         public override bool ChecksumsValid => true;
         public override string ChecksumInfo => string.Empty;
@@ -103,7 +115,7 @@ namespace PKHeX.Core
             PokeDex = 0;
             TeamIndexes.LoadBattleTeams();
 
-            int rev = Zukan.GetRevision();
+            int rev = SaveRevision;
             if (rev == 0)
             {
                 m_move = Legal.MaxMoveID_8_O0;

PKHeX.Core/Saves/Substructures/Misc/ISaveFileRevision.cs

@@ -0,0 +1,8 @@
+namespace PKHeX.Core
+{
+    public interface ISaveFileRevision
+    {
+        public int SaveRevision { get; }
+        string SaveRevisionString { get; }
+    }
+}

PKHeX.WinForms/MainWindow/Main.cs

@@ -819,6 +819,8 @@ namespace PKHeX.WinForms
         private static string GetProgramTitle(SaveFile sav)
         {
             string title = GetProgramTitle() + $" - {sav.GetType().Name}: ";
+            if (sav is ISaveFileRevision rev)
+                title = title.Insert(title.Length - 2, rev.SaveRevisionString);
             var ver = GameInfo.GetVersionName(sav.Version);
             if (Settings.Default.HideSAVDetails)
                 return title + $"[{ver}]";