Add 'group-title' channel parsing

Emby.Server.Implementations/LiveTv/TunerHosts/M3uParser.cs

@@ -133,6 +133,11 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts
                 channel.ImageUrl = value;
             }
 
+            if (attributes.TryGetValue("group-title", out string groupTitle))
+            {
+                channel.ChannelGroup = groupTitle;
+            }
+
             channel.Name = GetChannelName(extInf, attributes);
             channel.Number = GetChannelNumber(extInf, attributes, mediaUrl);
 

MediaBrowser.Controller/LiveTv/ChannelInfo.cs

@@ -45,6 +45,12 @@ namespace MediaBrowser.Controller.LiveTv
         /// <value>The type of the channel.</value>
         public ChannelType ChannelType { get; set; }
 
+        /// <summary>
+        /// Gets or sets the group of the channel
+        /// </summary>
+        /// <value>The group of the channel</value>
+        public string ChannelGroup { get; set; }
+
         /// <summary>
         /// Supply the image path if it can be accessed directly from the file system.
         /// </summary>