Provide event for changed breakpoint image

ILSpy.SharpDevelop.LGPL/Bookmarks/BreakpointBookmark.cs

@@ -63,6 +63,8 @@ namespace ICSharpCode.ILSpy.Debugger.Bookmarks
 					isEnabled = value;
 					if (IsEnabledChanged != null)
 						IsEnabledChanged(this, EventArgs.Empty);
+					if (ImageChanged != null)
+					    ImageChanged(this, EventArgs.Empty); // Image property reflects IsEnabled property
 					Redraw();
 				}
 			}
@@ -86,6 +88,8 @@ namespace ICSharpCode.ILSpy.Debugger.Bookmarks
 			}
 		}
 		
+		public event EventHandler ImageChanged;
+		
 		public override ITextMarker CreateMarker(ITextMarkerService markerService, int offset, int length)
 		{
 			ITextMarker marker = markerService.Create(offset, length);