- Only send notices for removed subscribers if they are actually a subscriber
- Fix invalid phrases on user not being found when saving options
- Migrate XF1 options format to XF2 format
- Track users to notify by user id instead of username to reliably handle username changes
- Fix error when deleting a user with a user upgrade via conversations
- If the sending user (or destination forum) is missing, log to the XF error log
- Cleanup how the notification thread/conversation is created
- Do not create notification thread/conversation inside the transaction