Added layer properties to core and hooked it up with the UI

Implemented timeline caret scrolling logic
Added special treeview style for the layer properties tree

src/Artemis.UI/Screens/Module/ProfileEditor/LayerProperties/Timeline/PropertyTimelineViewModel.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Linq;
 using Stylet;
 
@@ -9,21 +10,46 @@ namespace Artemis.UI.Screens.Module.ProfileEditor.LayerProperties.Timeline
         public PropertyTimelineViewModel(LayerPropertiesViewModel layerPropertiesViewModel)
         {
             LayerPropertiesViewModel = layerPropertiesViewModel;
-            RailItemViewModels = new BindableCollection<PropertyTrackViewModel>();
+            PropertyTrackViewModels = new BindableCollection<PropertyTrackViewModel>();
         }
 
         public LayerPropertiesViewModel LayerPropertiesViewModel { get; }
 
         public double Width { get; set; }
-        public BindableCollection<PropertyTrackViewModel> RailItemViewModels { get; set; }
+        public BindableCollection<PropertyTrackViewModel> PropertyTrackViewModels { get; set; }
 
         public void UpdateEndTime()
         {
             // End time is the last keyframe + 10 sec
-            var lastKeyFrame = RailItemViewModels.SelectMany(r => r.KeyframeViewModels).OrderByDescending(t => t.Keyframe.Position).FirstOrDefault();
+            var lastKeyFrame = PropertyTrackViewModels.SelectMany(r => r.KeyframeViewModels).OrderByDescending(t => t.Keyframe.Position).FirstOrDefault();
             var endTime = lastKeyFrame?.Keyframe.Position.Add(new TimeSpan(0, 0, 0, 10)) ?? TimeSpan.FromSeconds(10);
 
             Width = endTime.TotalSeconds * LayerPropertiesViewModel.PixelsPerSecond;
+
+            // Ensure the caret isn't outside the end time
+            if (LayerPropertiesViewModel.CurrentTime > endTime)
+                LayerPropertiesViewModel.CurrentTime = endTime;
+        }
+
+        public void PopulateProperties(List<LayerPropertyViewModel> properties)
+        {
+            PropertyTrackViewModels.Clear();
+            foreach (var property in properties)
+                CreateViewModels(property);
+
+            UpdateEndTime();
+        }
+
+        private void CreateViewModels(LayerPropertyViewModel property)
+        {
+            PropertyTrackViewModels.Add(new PropertyTrackViewModel(this, property));
+            foreach (var child in property.Children)
+                CreateViewModels(child);
+        }
+
+        public void ClearProperties()
+        {
+            PropertyTrackViewModels.Clear();
         }
     }
 }