huge commit for advanced stats feature.

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

Data/Abstractions/IDataValueCache.cs

@@ -0,0 +1,12 @@
+using System;
+using System.Threading.Tasks;
+using Microsoft.EntityFrameworkCore;
+
+namespace Data.Abstractions
+{
+    public interface IDataValueCache<T, V> where T : class
+    {
+        void SetCacheItem(Func<DbSet<T>, Task<V>> itemGetter, string keyName, TimeSpan? expirationTime = null);
+        Task<V> GetCacheItem(string keyName);
+    }
+}