update models to use new ModelBase

Oqtane.Shared/Models/File.cs

@@ -7,7 +7,7 @@ namespace Oqtane.Models
     /// <summary>
     /// Describes a File in Oqtane
     /// </summary>
-    public class File : IAuditable
+    public class File : ModelBase
     {
         /// <summary>
         /// ID to identify the file
@@ -55,22 +55,6 @@ namespace Oqtane.Models
         /// </summary>
         public string Description { get; set; }
 
-        #region IAuditable Properties
-
-        /// <inheritdoc />
-        public string CreatedBy { get; set; }
-
-        /// <inheritdoc />
-        public DateTime CreatedOn { get; set; }
-
-        /// <inheritdoc />
-        public string ModifiedBy { get; set; }
-
-        /// <inheritdoc />
-        public DateTime ModifiedOn { get; set; }
-
-        #endregion
-
         #region Extended IAuditable Properties, may be moved to an Interface some day so not documented yet
 
         public string DeletedBy { get; set; }