Basic implementation of a few editor tools

src/Artemis.Core/Models/Profile/Folder.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Linq;
+using Artemis.Core.Models.Profile.LayerShapes;
 using Artemis.Core.Models.Surface;
 using Artemis.Storage.Entities.Profile;
 using SkiaSharp;
@@ -72,6 +73,7 @@ namespace Artemis.Core.Models.Profile
         public Layer AddLayer(string name)
         {
             var layer = new Layer(Profile, this, name) {Order = Children.LastOrDefault()?.Order ?? 1};
+            layer.LayerShape = new Fill(layer);
             AddChild(layer);
             return layer;
         }

src/Artemis.Core/Models/Profile/Layer.cs

@@ -97,7 +97,8 @@ namespace Artemis.Core.Models.Profile
             set
             {
                 _layerShape = value;
-                _layerShape.CalculateRenderProperties();
+                if (Path != null)
+                    _layerShape.CalculateRenderProperties();
             }
         }
 
@@ -146,15 +147,18 @@ namespace Artemis.Core.Models.Profile
             LayerEntity.Condition.Clear();
 
             // Brush
-            LayerEntity.BrushEntity = new BrushEntity
+            if (LayerBrush != null)
             {
-                BrushPluginGuid = LayerBrush.Descriptor.LayerBrushProvider.PluginInfo.Guid,
-                BrushType = LayerBrush.GetType().Name,
-                Configuration = JsonConvert.SerializeObject(LayerBrush.Settings)
-            };
+                LayerEntity.BrushEntity = new BrushEntity
+                {
+                    BrushPluginGuid = LayerBrush.Descriptor.LayerBrushProvider.PluginInfo.Guid,
+                    BrushType = LayerBrush.GetType().Name,
+                    Configuration = JsonConvert.SerializeObject(LayerBrush.Settings)
+                };
+            }
 
             // Shape
-            LayerShape.ApplyToEntity();
+            LayerShape?.ApplyToEntity();
         }
 
         /// <summary>

src/Artemis.Core/Models/Profile/Profile.cs

@@ -67,6 +67,11 @@ namespace Artemis.Core.Models.Profile
             }
         }
 
+        public Folder GetRootFolder()
+        {
+            return (Folder) Children.Single();
+        }
+
         internal override void ApplyToEntity()
         {
             ProfileEntity.Id = EntityId;