Profile editor - Redesigned adding/removing timeline segments

General module - Added some basic window information to the data model
Profiles - Don't render when opacity is 0
Profile editor - Render non-selected layers in their main segment
Profile editor - Condition editor fixes

src/Artemis.UI/Converters/InverseBooleanConverter.cs

@@ -12,10 +12,12 @@ namespace Artemis.UI.Converters
         public object Convert(object value, Type targetType, object parameter,
             CultureInfo culture)
         {
-            if (targetType != typeof(bool))
-                throw new InvalidOperationException("The target must be a boolean");
+            if (targetType == typeof(bool))
+                return !(bool) value;
+            if (targetType == typeof(bool?))
+                return !(bool?) value;
 
-            return !(bool) value;
+            throw new InvalidOperationException("The target must be a boolean");
         }
 
         public object ConvertBack(object value, Type targetType, object parameter,