* Replace user facing pagination with Flask SQLAlchemy Pagination objects
* Closes#1353
I think this is a big improvement but I feel like this is harder to create a theme construct around.
* Remove Python 2 specific code
* Require imports to have a proper isort-supported order
* Only test/lint on Python 3
* Bump most dependencies to latest supported version
* Add `view=admin` GET param to `/api/v1/users`, `/api/v1/teams`, and `/api/v1/challenges` to bypass filtering for admins
* Closes#1423#1445
* Related to #1165
2.4.3 / 2020-05-24
==================
**Miscellaneous**
* Notifications/Events endpoint will now immediately send a ping instead of waiting a few seconds.
* Upgrade `gunicorn` dependency to `19.10.0`
* Upgrade `boto3` dependency to `1.13.9`
* Improve `import_ctf()` reliability by closing all connections before dropping & recreating database
* Close database session in IP tracking code in failure situations to avoid potential dangling database connections
* Don't allow backups to be imported if they do not have a `db` folder
* Change `import_ctf()` process slightly to import built-in tables first and then plugin tables
* Handle exception where a regex Flag is invalid
**API**
* File deletion endpoint (`DELETE /api/v1/files/[file_id]`) will now correctly delete the associated file
**Plugins**
* Add `CTFd.plugins.get_plugin_names()` to get a list of available plugins
* Add `CTFd.plugins.migrations.current()` to get the current revision of a plugin migration
* Improve `CTFd.plugins.migrations.upgrade()` to be able to upgrade to a specific plugin migration
* Run plugin migrations during import process
**Themes**
* Update jQuery to v3.5.1 to fix mobile hamburger menu
* Upgrade some dependencies in yarn lockfile
* Fix invalid team link being generated in `scoreboard.js`
**Admin Panel**
* Fix sending of user creation notification email
* Fix button to remove users from teams
* Improve `import_ctf()` reliability by closing all connections before dropping & recreating database
* Close database session in IP tracking code in failure situations
