- added partial support for Philips .xml channel lists

(There are MANY different file formats, only a few are currently supported)
- fixed "most-recently-used" getting reversed every time the program was started
- added "UTF-8 (Unicode)" character set to menu
- fixed disappearing columns when loading different channel lists without restarting the application

source/ChanSort.Api/Model/ChannelList.cs

@@ -20,7 +20,7 @@ namespace ChanSort.Api
       this.SignalSource = source;
       this.ShortCaption = caption;
       this.FirstProgramNumber = (source & SignalSource.Digital) != 0 ? 1 : 0;
-      this.VisibleColumnFieldNames = DefaultVisibleColumns;
+      this.VisibleColumnFieldNames = DefaultVisibleColumns.ToList(); // create copy of default list, so it can be modified
     }
 
     public string ShortCaption { get; }

source/ChanSort.Api/Model/Enums.cs

@@ -24,6 +24,8 @@ namespace ChanSort.Api
     Sat = 0x0040,
     IP = 0x0080,
 
+    MaskAdInput = MaskAnalogDigital | MaskAntennaCableSat,
+
     // bit 9+10: TV/Radio
     MaskTvRadio = 0x0300,
     Tv = 0x0100,