Profile editor - Fixed new profile elements not always appearing

UI - Fixed all the memory leaks I could find, closing the UI now frees a lot of RAM
Noise brush - Decreased memory usage by removing unused 4D noise
Layout editor - Fixed device properties not always applying

src/Artemis.UI/Converters/InverseBooleanConverter.cs

@@ -9,8 +9,7 @@ namespace Artemis.UI.Converters
     {
         #region IValueConverter Members
 
-        public object Convert(object value, Type targetType, object parameter,
-            CultureInfo culture)
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
         {
             if (targetType == typeof(bool))
                 return !(bool) value;
@@ -20,10 +19,14 @@ namespace Artemis.UI.Converters
             throw new InvalidOperationException("The target must be a boolean");
         }
 
-        public object ConvertBack(object value, Type targetType, object parameter,
-            CultureInfo culture)
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
         {
-            throw new NotSupportedException();
+            if (targetType == typeof(bool))
+                return !(bool) value;
+            if (targetType == typeof(bool?))
+                return !(bool?) value;
+
+            throw new InvalidOperationException("The target must be a boolean");
         }
 
         #endregion