- added experimental support for Loewe / Hisense 2017 servicelist.db

file format
- show error message when trying to open a .zip file that doen't contain
  the expected files of a Samsung J series or Toshiba .zip channel list
- show error message when trying to open a broken .zip file, which is
  most likely caused by exporting to a USB stick formatted with NTFS
- allow changing the "crypt" flag for Samsung .scm lists
- iterating through loaders supporting a file extension till one can read the file

source/ChanSort.Loader.Hisense/HisDbSerializer.cs

@@ -151,6 +151,10 @@ namespace ChanSort.Loader.Hisense
         {
           this.RepairCorruptedDatabaseImage(cmd);
           this.LoadTableNames(cmd);
+
+          if (!tableNames.Contains("svl_1") && !tableNames.Contains("svl_2") && !tableNames.Contains("svl_3"))
+            throw new FileLoadException("File doesn't contain svl_* tables");
+
           this.LoadSatelliteData(cmd);
           this.LoadTslData(cmd);
           this.LoadSvlData(cmd);

source/ChanSort.Loader.Hisense/HisDbSerializerPlugin.cs

@@ -1,26 +1,15 @@
-#define HISENSE_ENABLED
-
-/*
-Support for the Hisense file format (Sep 2015) is currently disabled due to the risk of damaging the TV when 
-users import files in an older/newer format than the currently installed firmware expects.
-*/
-
-using ChanSort.Api;
+using ChanSort.Api;
 
 namespace ChanSort.Loader.Hisense
 {
-#if HISENSE_ENABLED
   public class HisDbSerializerPlugin : ISerializerPlugin
   {
     public string PluginName => "Hisense channel.db";
-    public string FileFilter => "channel*.db";
+    public string FileFilter => "*.db";
 
-#region CreateSerializer()
     public SerializerBase CreateSerializer(string inputFile)
     {
       return new HisDbSerializer(inputFile);
     }
-#endregion
   }
-#endif
-}
+}