- added function to mark a channel for swapping + swap with current channel

- replaced misuse of "FileLoadException" with a custom LoaderException to handle file loading issues with better continue/fail logic
- removed "Save As" and replaced it with "Convert list" menu item that shows information on how to use a reference list instead of direct conversion

source/ChanSort.Loader.Panasonic/IdtvChannelSerializer.cs

@@ -154,7 +154,6 @@ internal class IdtvChannelSerializer : SerializerBase
     dbFile = Path.Combine(dir, "tv.db");
     binFile = Path.Combine(dir, "channel", "idtvChannel.bin");
 
-    this.Features.CanSaveAs = false;
     this.Features.FavoritesMode = FavoritesMode.Flags;
     this.Features.DeleteMode = DeleteMode.FlagWithPrNr;
 

source/ChanSort.Loader.Panasonic/XmlSerializer.cs

@@ -41,7 +41,6 @@ namespace ChanSort.Loader.Panasonic
       this.Features.CanLockChannels = false;
       this.Features.CanHideChannels = false;
       this.Features.DeleteMode = DeleteMode.NotSupported;
-      this.Features.CanSaveAs = true;
       this.Features.AllowGapsInFavNumbers = true;
       this.Features.CanEditFavListNames = false;