Add comment support for all rule types

Filtration.ObjectModel/BlockItemBaseTypes/BlockItembase.cs

@@ -17,6 +17,7 @@ namespace Filtration.ObjectModel.BlockItemBaseTypes
         public abstract Color SummaryBackgroundColor { get; }
         public abstract Color SummaryTextColor { get; }
         public abstract int SortOrder { get; }
+        public string Comment { get; set; }
 
         public bool IsDirty
         {

Filtration.ObjectModel/IBlockItemWithTheme.cs

@@ -4,6 +4,6 @@ namespace Filtration.ObjectModel
 {
     public interface IBlockItemWithTheme : IItemFilterBlockItem
     {
-        ThemeComponent ThemeComponent { get; }
+        ThemeComponent ThemeComponent { get; set; }
     }
 }

Filtration.ObjectModel/IItemFilterBlockItem.cs

@@ -14,5 +14,6 @@ namespace Filtration.ObjectModel
         int MaximumAllowed { get; }
         int SortOrder { get; }
         bool IsDirty { get; }
+        string Comment { get; set; }
     }
 }