huge commit for advanced stats feature.

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

Data/Models/EFMeta.cs

@@ -0,0 +1,39 @@
+using Data.Models.Client;
+using System;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Data.Models
+{
+    /// <summary>
+    /// This class encapsulates any meta fields as a simple string 
+    /// </summary>
+    public class EFMeta : SharedEntity
+    {
+        public const string ClientTagName = nameof(ClientTagName);
+        public const string ClientTag = nameof(ClientTag);
+
+        [Key]
+        public int MetaId { get; set; }
+        [Required]
+        public DateTime Created { get; set; } = DateTime.UtcNow;
+        [Required]
+        public DateTime Updated { get; set; } = DateTime.UtcNow;
+        public int? ClientId { get; set; }
+        // this is the client that the meta could belong to
+        [ForeignKey(nameof(ClientId))]
+        public virtual EFClient Client { get; set; }
+        [Required]
+        [MinLength(3)]
+        [StringLength(32)]
+        [MaxLength(32)]
+        public string Key { get; set; }
+        [Required]
+        public string Value { get; set; }
+        public string Extra { get; set; }
+
+        public int? LinkedMetaId { get; set; }
+        [ForeignKey(nameof(LinkedMetaId))]
+        public virtual EFMeta LinkedMeta { get; set; }
+    }
+}