WAITING FOR OTTO - Resolve "Email Notifications - Scheduled / On-Demand"

Description

• Raise request updates are sent to the requestee upon approval/rejection
• Button for coordinator to remind teachers of unhandled applications
• Automated emails to remind teachers of unhandled applications/declarations after deadline

Related Issues

• Resolves #141

Checklist

• I have added a changelog entry to reflect the significant changes I made.