New: Cleanup Recycling Bin folders older than X days (0 to disable)

Co-Authored-By: Mark McDowall <markus101@users.noreply.github.com>

src/NzbDrone.Core/Configuration/ConfigService.cs

@@ -92,6 +92,12 @@ namespace NzbDrone.Core.Configuration
             set { SetValue("RecycleBin", value); }
         }
 
+        public int RecycleBinCleanupDays
+        {
+            get { return GetValueInt("RecycleBinCleanupDays", 7); }
+            set { SetValue("RecycleBinCleanupDays", value); }
+        }
+
         public int RssSyncInterval
         {
             get { return GetValueInt("RssSyncInterval", 15); }