Implemented layer elements

Added a brush layer element
Corsair - Added ST100 RGB layout

src/Artemis.UI/Screens/Module/ProfileEditor/LayerElements/Dialogs/AddLayerElementViewModel.cs

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+using System.Windows.Input;
+using Artemis.Core.Models.Profile;
+using Artemis.Core.Plugins.LayerElement;
+using Artemis.Core.Services.Interfaces;
+using Artemis.UI.ViewModels.Dialogs;
+using Stylet;
+
+namespace Artemis.UI.Screens.Module.ProfileEditor.LayerElements.Dialogs
+{
+    public class AddLayerElementViewModel : DialogViewModelBase
+    {
+        private readonly ILayerService _layerService;
+
+
+        public AddLayerElementViewModel(IPluginService pluginService, ILayerService layerService, Layer layer)
+        {
+            _layerService = layerService;
+            Layer = layer;
+
+            LayerElementDescriptors = new BindableCollection<LayerElementDescriptor>();
+            var layerElementProviders = pluginService.GetPluginsOfType<LayerElementProvider>();
+            foreach (var layerElementProvider in layerElementProviders)
+                LayerElementDescriptors.AddRange(layerElementProvider.LayerElementDescriptors);
+        }
+
+        public Layer Layer { get; }
+
+        public LayerElementDescriptor SelectedLayerElementDescriptor { get; set; }
+        public BindableCollection<LayerElementDescriptor> LayerElementDescriptors { get; set; }
+        public bool CanAccept => SelectedLayerElementDescriptor != null;
+
+        public void Accept()
+        {
+            var layerElement = _layerService.InstantiateLayerElement(Layer, SelectedLayerElementDescriptor);
+            Session.Close(layerElement);
+        }
+
+        public void Cancel()
+        {
+            Session.Close();
+        }
+
+        #region View event handlers
+
+        public void ListBoxItemMouseClick(object sender, MouseButtonEventArgs args)
+        {
+            if (args.ClickCount > 1 && SelectedLayerElementDescriptor != null)
+                Accept();
+        }
+
+        #endregion
+    }
+}