Data model - Improved encapsulation

Conditions - Renamed from DisplayConditions to DataModelConditions to better match their nature
Core - More documentation

src/Artemis.Core/Plugins/LayerBrushes/BrushConfigurationViewModel.cs

@@ -2,13 +2,23 @@
 
 namespace Artemis.Core.LayerBrushes
 {
+    /// <summary>
+    ///     Represents a view model for a brush configuration window
+    /// </summary>
     public abstract class BrushConfigurationViewModel : Screen
     {
+        /// <summary>
+        ///     Creates a new instance of the <see cref="BrushConfigurationViewModel" /> class
+        /// </summary>
+        /// <param name="layerBrush"></param>
         protected BrushConfigurationViewModel(BaseLayerBrush layerBrush)
         {
             LayerBrush = layerBrush;
         }
 
+        /// <summary>
+        ///     Gets the layer brush this view model is associated with
+        /// </summary>
         public BaseLayerBrush LayerBrush { get; }
     }
 }