Improved client handling and episode models

EstusShots.Gtk/Controls/DataColumn.cs

@@ -1,16 +1,32 @@
+using System;
+
 namespace EstusShots.Gtk.Controls
 {
     public class DataColumn
     {
-        public string PropertyName { get; set; }
-        
-        public string Title { get; set; }
-
-        public DataColumn()  { }
+        public DataColumn()
+        {
+        }
 
         public DataColumn(string propertyName)
         {
             PropertyName = propertyName;
         }
+
+        /// <summary>
+        ///     The name of the property in the data source, that should be show nin the view
+        /// </summary>
+        public string PropertyName { get; }
+
+        /// <summary>
+        ///     The column header.
+        /// </summary>
+        public string Title { get; set; }
+
+        /// <summary>
+        ///     Applies the given transformation on each item in the column.
+        ///     This changes only the display of the value.
+        /// </summary>
+        public Func<object, string> Format { get; set; }
     }
 }