Start Date and Expiry Date for Module instances and Pages #3538

This is complete excluding Reporting and Notifications which can be added at a later date.  I just really wanted to get the schema and the functionality into place.

Oqtane.Shared/Models/Page.cs

@@ -82,6 +82,14 @@ namespace Oqtane.Models
         public bool IsNavigation { get; set; }
         public bool IsClickable { get; set; }
         public int? UserId { get; set; }
+        /// <summary>
+        /// Start of when this assignment is valid. See also <see cref="ExpiryDate"/>
+        /// </summary>
+        public DateTime? EffectiveDate { get; set; }
+        /// <summary>
+        /// End of when this assignment is valid. See also <see cref="EffectiveDate"/>
+        /// </summary>
+        public DateTime? ExpiryDate { get; set; }
         public bool IsPersonalizable { get; set; }
 
         #region IDeletable Properties