Move SWSH save abstractions to subfolder

PKHeX.Core/Saves/Substructures/Gen8/SWSH/MyStatus8.cs

@@ -162,7 +162,7 @@ public int Language
             }
         }
 
-        private Span<byte> OT_Trash =>Data.AsSpan(0xB0, 0x1A);
+        private Span<byte> OT_Trash => Data.AsSpan(0xB0, 0x1A);
 
         public string OT
         {

PKHeX.Core/Saves/Substructures/Gen8/SWSH/Party8.cs

@@ -2,7 +2,7 @@
 {
     public sealed class Party8 : SaveBlock
     {
-        public Party8(SaveFile sav, SCBlock block) : base(sav, block.Data) { }
+        public Party8(SAV8 sav, SCBlock block) : base(sav, block.Data) { }
 
         public int PartyCount
         {
@@ -10,4 +10,4 @@ public int PartyCount
             set => Data[6 * PokeCrypto.SIZE_8PARTY] = (byte)value;
         }
     }
-}
+}