Layer properties - Added drag-editing for number-based properties

Layer properties - Added min and max values
Nuget - Updated Stylet to 1.3.1

src/Artemis.Plugins.LayerBrushes.Color/ColorBrush.cs

@@ -53,7 +53,7 @@ namespace Artemis.Plugins.LayerBrushes.Color
 
         public override void Render(SKCanvas canvas, SKImageInfo canvasInfo, SKPath path, SKPaint paint)
         {
-            if (path.Bounds != _shaderBounds) 
+            if (path.Bounds != _shaderBounds)
                 CreateShader(path.Bounds);
 
             paint.Shader = _shader;