Download Support (#298)

* Implemented the ability to download files (series, volume, chapter)

* Added RBS checks to ensure user is either an admin or has download role

* Added the ability to change a users feature RBS. Changed the Role seed to use reflection

API/DTOs/UpdateRBSDto.cs

@@ -0,0 +1,10 @@
+using System.Collections.Generic;
+
+namespace API.DTOs
+{
+    public class UpdateRbsDto
+    {
+        public string Username { get; init; }
+        public IList<string> Roles { get; init; }
+    }
+}