huge commit for advanced stats feature.

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

Data/Abstractions/IUniqueId.cs

@@ -0,0 +1,13 @@
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Data.Abstractions
+{
+    public interface IUniqueId
+    {
+        [NotMapped]
+        long Id { get; }
+
+        [NotMapped]
+        string Value { get; }
+    }
+}