Add libraries for EntityFramework

Stats plugin work
Allow plugins to dynamically add EF classes to the context

Plugins/SimpleStats/Models/EFClientKill.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+using SharedLibrary.Database.Models;
+using System.ComponentModel.DataAnnotations.Schema;
+using SharedLibrary.Helpers;
+using System.ComponentModel.DataAnnotations;
+
+namespace StatsPlugin.Models
+{
+   public class EFClientKill : SharedEntity
+    {
+        public EFClientKill() { }
+
+        [Key]
+        public long KillId { get; set; }
+        public int VictimId { get; set; }
+        [ForeignKey("VictimId")]
+        public virtual EFClient Victim { get; set; }
+        public int AttackerId { get; set; }
+        [ForeignKey("AttackerId")]
+        public virtual EFClient Attacker { get; set; }
+        public int ServerId { get; set; }
+        [ForeignKey("ServerId")]
+        public virtual EFServer Server { get; set; }
+        public IW4Info.HitLocation HitLoc { get; set; }
+        public IW4Info.MeansOfDeath DeathType { get; set; }
+        public int Damage { get; set; }
+        public IW4Info.WeaponName Weapon { get; set; }
+        public Vector3 KillOrigin { get; set; }
+        public Vector3 DeathOrigin { get; set; }
+        // http://wiki.modsrepository.com/index.php?title=Call_of_Duty_5:_Gameplay_standards for conversion to meters
+        [NotMapped]
+        public double Distance => Vector3.Distance(KillOrigin, DeathOrigin) * 0.0254;
+        public IW4Info.MapName Map { get; set; }
+    }
+}