v2.6.2

1.Added order_id and is_pinned to announcement, challenges
2.Removed "forward to Discord" function in announcement
3.Added is_pinned and timestamp to downloads
4.Improved announcement, challenge, downloads, event PATCHing to autofill unprovided fields
5.Improved announcement, downloads list ordering and filtering
6.Renamed event notification to upcoming_event
7.Added new_announcement, new_challenge, new_downloads, new_event notifications