update models to use new ModelBase

Oqtane.Shared/Models/Alias.cs

@@ -7,7 +7,7 @@ namespace Oqtane.Models
     /// <summary>
     /// An Alias maps a url like `oqtane.my` or `oqtane.my/products` to a <see cref="Oqtane.Models.Site"/> and <see cref="Oqtane.Models.Tenant"/>
     /// </summary>
-    public class Alias : IAuditable
+    public class Alias : ModelBase
     {
         /// <summary>
         /// The primary ID for internal use. It's also used in API calls to identify the site. 
@@ -36,18 +36,6 @@ namespace Oqtane.Models
         /// </summary>
         public bool IsDefault { get; set; }
 
-        /// <inheritdoc />
-        public string CreatedBy { get; set; }
-
-        /// <inheritdoc />
-        public DateTime CreatedOn { get; set; }
-        
-        /// <inheritdoc />
-        public string ModifiedBy { get; set; }
-        
-        /// <inheritdoc />
-        public DateTime ModifiedOn { get; set; }
-
         /// <summary>
         /// The path contains the url-part after the first slash.
         /// * If the Name is `oqtane.me` the Path is empty