Database Warning

In this release, the database format was changed. Please read the instructions of migrate.py for instructions on how to migrate.

Changes in this version

Add instancing feature
- Instanced pwn/web challenges built-in now
Overhaul permissions
- Admins/superadmins/problem manager roles are now assignable
Add CTFtime live scoreboard
Improve contest scoreboard UX
- Competitors should now be significantly less likely to accidentally use the practice leaderboard during a contest
Add flag hint to practice problems
Allow problem attachments to be edited
API improvements
Security fixes
Bug fixes
Other usability improvements
Update dependencies
Update tests
Code cleanup