remove explicit backing fields for property bags

src/ImageSharp/Configuration.cs

@@ -28,8 +28,6 @@ namespace SixLabors.ImageSharp
 
         private int maxDegreeOfParallelism = Environment.ProcessorCount;
 
-        private Dictionary<object, object> properties = new Dictionary<object, object>();
-
         /// <summary>
         /// Initializes a new instance of the <see cref="Configuration" /> class.
         /// </summary>
@@ -80,7 +78,7 @@ namespace SixLabors.ImageSharp
         /// Gets a set of properties for the Congiguration.
         /// </summary>
         /// <remarks>This can be used for storing global settings and defaults to be accessable to processors.</remarks>
-        public IDictionary<object, object> Properties => this.properties;
+        public IDictionary<object, object> Properties { get; } = new Dictionary<object, object>();
 
         /// <summary>
         /// Gets the currently registered <see cref="IImageFormat"/>s.

src/ImageSharp/Processing/DefaultImageProcessorContext{TPixel}.cs

@@ -16,7 +16,6 @@ namespace SixLabors.ImageSharp.Processing
     {
         private readonly bool mutate;
         private readonly Image<TPixel> source;
-        private readonly Dictionary<object, object> properties = new Dictionary<object, object>();
         private Image<TPixel> destination;
 
         /// <summary>
@@ -42,7 +41,7 @@ namespace SixLabors.ImageSharp.Processing
         public Configuration Configuration { get; }
 
         /// <inheritdoc/>
-        public IDictionary<object, object> Properties => this.properties;
+        public IDictionary<object, object> Properties { get; } = new Dictionary<object, object>();
 
         /// <inheritdoc/>
         public Image<TPixel> GetResultImage()