huge commit for advanced stats feature.

broke data out into its own library.
may be breaking changes with existing plugins

Data/Abstractions/IPropertyExtender.cs

@@ -0,0 +1,23 @@
+namespace Data.Abstractions
+{
+    /// <summary>
+    /// describes the capability of extending properties by name
+    /// </summary>
+    interface IPropertyExtender
+    {
+        /// <summary>
+        /// adds or updates property by name
+        /// </summary>
+        /// <param name="name">unique name of the property</param>
+        /// <param name="value">value of the property</param>
+        void SetAdditionalProperty(string name, object value);
+
+        /// <summary>
+        /// retreives a property by name
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="name">name of the property</param>
+        /// <returns>property value if exists, otherwise default T</returns>
+        T GetAdditionalProperty<T>(string name);
+    }
+}