huge commit for advanced stats feature.

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

Data/Abstractions/ILookupCache.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace Data.Abstractions
+{
+    public interface ILookupCache<T> where T : class
+    {
+        Task InitializeAsync();
+        Task<T> AddAsync(T item);
+        Task<T> FirstAsync(Func<T, bool> query);
+        IEnumerable<T> GetAll();
+    }
+}