huge commit for advanced stats feature.

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

Data/Models/EFChangeHistory.cs

@@ -0,0 +1,30 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Data.Models
+{
+    /// <summary>
+    /// This class models the change to different entities 
+    /// </summary>
+    public class EFChangeHistory : SharedEntity
+    {
+        public enum ChangeType
+        {
+            Permission,
+            Ban,
+            Command
+        }
+
+        [Key]
+        public int ChangeHistoryId { get; set; }
+        public int OriginEntityId { get; set; }
+        public int TargetEntityId { get; set; }
+        public int? ImpersonationEntityId { get; set; }
+        public ChangeType TypeOfChange { get; set; }
+        public DateTime TimeChanged { get; set; } = DateTime.UtcNow;
+        [MaxLength(128)]
+        public string Comment { get; set; }
+        public string PreviousValue { get; set; }
+        public string CurrentValue { get; set; }
+    }
+}