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.Core/Models/Profile/LayerShapes/Fill.cs

@@ -7,6 +7,7 @@ namespace Artemis.Core.Models.Profile.LayerShapes
         public Fill(Layer layer) : base(layer)
         {
         }
+
         internal Fill(Layer layer, ShapeEntity shapeEntity) : base(layer, shapeEntity)
         {
         }