Added layer shapes, editor is still WIP

src/Artemis.Core/Plugins/LayerBrush/LayerBrushProvider.cs

@@ -0,0 +1,28 @@
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using Artemis.Core.Plugins.Abstract;
+using Artemis.Core.Plugins.Models;
+
+namespace Artemis.Core.Plugins.LayerBrush
+{
+    /// <inheritdoc />
+    /// <summary>
+    ///     Allows you to create one or more <see cref="LayerBrush" />s usable by profile layers.
+    /// </summary>
+    public abstract class LayerBrushProvider : Plugin
+    {
+        private readonly List<LayerBrushDescriptor> _layerBrushDescriptors;
+
+        protected LayerBrushProvider(PluginInfo pluginInfo) : base(pluginInfo)
+        {
+            _layerBrushDescriptors = new List<LayerBrushDescriptor>();
+        }
+
+        public ReadOnlyCollection<LayerBrushDescriptor> LayerBrushDescriptors => _layerBrushDescriptors.AsReadOnly();
+
+        protected void AddLayerBrushDescriptor<T>(string displayName, string description, string icon) where T : LayerBrush
+        {
+            _layerBrushDescriptors.Add(new LayerBrushDescriptor(displayName, description, icon, typeof(T), this));
+        }
+    }
+}