huge commit for advanced stats feature.

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

Data/Models/Client/Stats/Reference/EFWeaponAttachment.cs

@@ -0,0 +1,21 @@
+using System.ComponentModel.DataAnnotations;
+using Data.Abstractions;
+using Stats.Models;
+
+namespace Data.Models.Client.Stats.Reference
+{
+    public class EFWeaponAttachment : AuditFields, IUniqueId
+    {
+        [Key]
+        public int WeaponAttachmentId { get; set; }
+
+        [Required]
+        public string Name { get; set; }
+        
+        [Required]
+        public Models.Reference.Game Game { get; set; }
+
+        public long Id => WeaponAttachmentId;
+        public string Value => Name;
+    }
+}