Implemented layer elements

Added a brush layer element
Corsair - Added ST100 RGB layout

src/Artemis.Plugins.LayerTypes.Brush/BrushLayerElementViewModel.cs

@@ -0,0 +1,14 @@
+using Artemis.Core.Plugins.LayerElement;
+
+namespace Artemis.Plugins.LayerElements.Brush
+{
+    public class BrushLayerElementViewModel : LayerElementViewModel
+    {
+        public BrushLayerElementViewModel(BrushLayerElement layerElement) : base(layerElement)
+        {
+            LayerElement = layerElement;
+        }
+
+        public new BrushLayerElement LayerElement { get; }
+    }
+}