Implemented layer elements

Added a brush layer element
Corsair - Added ST100 RGB layout

src/Artemis.Core/Plugins/LayerElement/LayerElement.cs

@@ -0,0 +1,47 @@
+using System.Drawing;
+using Artemis.Core.Models.Profile;
+using Artemis.Core.Models.Surface;
+
+namespace Artemis.Core.Plugins.LayerElement
+{
+    public abstract class LayerElement
+    {
+        protected LayerElement(Layer layer, LayerElementSettings settings, LayerElementDescriptor descriptor)
+        {
+            Layer = layer;
+            Settings = settings;
+            Descriptor = descriptor;
+        }
+
+        public Layer Layer { get; }
+        public LayerElementSettings Settings { get; }
+        public LayerElementDescriptor Descriptor { get; }
+
+        /// <summary>
+        ///     Called by the profile editor to populate the layer element properties panel
+        /// </summary>
+        /// <returns></returns>
+        public abstract LayerElementViewModel GetViewModel();
+
+        /// <summary>
+        ///     Called before rendering every frame, write your update logic here
+        /// </summary>
+        /// <param name="deltaTime"></param>
+        public abstract void Update(double deltaTime);
+
+        /// <summary>
+        ///     Called before rendering, in the order configured on the layer
+        /// </summary>
+        public abstract void RenderPreProcess(ArtemisSurface surface, Graphics graphics);
+
+        /// <summary>
+        ///     Called during rendering, in the order configured on the layer
+        /// </summary>
+        public abstract void Render(ArtemisSurface surface, Graphics graphics);
+
+        /// <summary>
+        ///     Called after rendering, in the order configured on the layer
+        /// </summary>
+        public abstract void RenderPostProcess(ArtemisSurface surface, Graphics graphics);
+    }
+}