Misc Bugfixes and Enhancements (#507)

* Removed some extra spam for the console

* Implemented the code to update RowVersion, which is our concurrency check

* Fixed a critical issue where more than one bookmark could occur for a given chapter due to a race condition. Now we use concurrency checks and we also gracefully allow more than one row, by only grabbing first.

* Cleaned up the logic for IHasConcurencyToken and updated the setters to be private.

* Lots of comments and when deleting a library, remove any user progress items for which chapters don't exist.

* When deleting a Series, cleanup user progress rows.

* Now after a scan of library, if a series is removed, collection tags are pruned as well if there are no longer any series bound to it.

* Updated the image on the Readme to show a better picture

* Small code cleanup to remove null check modifier as I check for null just before then

* Fixed images loading multiple times due to using function in binding with random. You can now click chapter images to read that chapter specifically.

* Fixed cards being different sizes when read vs unread

* Moved over Robbie's workflow changes from notifier. Commented out activity indicators as that is not shipping with this release.

* Remove code that isn't needed

* Reverted GA

* Changed GA to trigger only when HEAD is updated

API/Constants/PolicyConstants.cs

@@ -1,12 +1,21 @@
 namespace API.Constants
 {
+    /// <summary>
+    /// Role-based Security
+    /// </summary>
     public static class PolicyConstants
     {
+        /// <summary>
+        /// Admin User. Has all privileges
+        /// </summary>
         public const string AdminRole = "Admin";
+        /// <summary>
+        /// Non-Admin User. Must be granted privileges by an Admin.
+        /// </summary>
         public const string PlebRole = "Pleb";
         /// <summary>
         /// Used to give a user ability to download files from the server
         /// </summary>
         public const string DownloadRole = "Download";
     }
-}
+}