Backend Bugfixes and Enhanced Selections (#754)

* Updated some signatures to avoid a ToArray() within a loop.

* Use UpdateSeries directly when adding new series, rather than a modified version for new series only.

* Refactored some messages for scanner loop to reduce duplicate code and write messages more clear. Hooked in a RefreshMetadataProgress event (no UI changes).

* Fixed a bug on docker where backup service was using different logic than non-docker, which isn't needed after config change last release.

* Allow user to make more than 1 backup per day

* Implemented a select all checkbox for library access modal

API/SignalR/MessageFactory.cs

@@ -60,6 +60,20 @@ namespace API.SignalR
             };
         }
 
+        public static SignalRMessage RefreshMetadataProgressEvent(int libraryId, float progress)
+        {
+            return new SignalRMessage()
+            {
+                Name = SignalREvents.RefreshMetadataProgress,
+                Body = new
+                {
+                    LibraryId = libraryId,
+                    Progress = progress,
+                    EventTime = DateTime.Now
+                }
+            };
+        }
+
 
 
         public static SignalRMessage RefreshMetadataEvent(int libraryId, int seriesId)