Set 3.5.0 release date (#2116)

# 3.5.0 / 2022-05-09

**General**

- Add a next challenge recommendation to challenges
- Add support for only viewing hints after unlocking another hint
- Add size checking and recommendation for images uploaded during setup

**Admin Panel**

- Imports now happen in the background so that admins can watch the status of the import
  - Add progress tracking to backup/export importing
  - Add `GET /admin/import` to see status of import
  - The public user facing portion of CTFd is now disabled during imports
- Fix issue where custom field entries for Users and Teams would be misaligned in the scoreboard CSV export
- Show admins the email server error message when email sending fails
- Fix issue where the current theme cannot be found in list of themes
- Fix page preview so that it accounts for the provided format
- Add links from User/Team Profile IP addresses to a User IP address search page
- Add city geolocation to Team Profile IP addresses

**API**

- Add the `count` meta field to the following endpoints:
  - `/api/v1/users/me/solves`
  - `/api/v1/users/me/fails`
  - `/api/v1/users/me/awards`
  - `/api/v1/teams/me/awards`
  - `/api/v1/users/[user_id]/solves`
  - `/api/v1/users/[user_id]/fails`
  - `/api/v1/users/[user_id]/awards`
  - `/api/v1/teams/[team_id]/solves`
  - `/api/v1/teams/[team_id]/awards`
- Improve speed of `/api/v1/teams/me/fails`
- Improve speed of `/api/v1/teams/[team_id]/fails`
- Improve speed of `/api/v1/users/me/fails`
- Improve speed of `/api/v1/users/[user_id]/fails`

**Deployment**

- Use Python 3.9 as the default Python version
- Prevent any possible usage of an already existing session ID by checking for duplicates during during session ID generation
- No longer install `python3-dev` in Dockerfile
- docker-compose.yml now uses `nginx:stable` as the image for nginx

**Plugins**

- `CTFd._internal.challenge.render` and `CTFd._internal.challenge.renderer` in the `view.js` Challenge type file has been deprecated. Instead Challenge plugins should refer to the `challenge.html` attribute provided by the API. Essentially CTFd is moving to having markdown & HTML rendered by the server instead of rendering on the client.

**Themes**

- Create the [`core-beta` theme](https://github.com/CTFd/core-beta) and begin documenting the creation of themes using Vite
- Add `userName` and `userEmail` to the CTFd init object in `base.html` for easier integration with other JavaScript code
- Add `teamId` and `teamName` to the CTFd init object in `base.html` for easier integration with other JavaScript code
- Adds the `Assets` constant to access front end assets from Jinja templates
- Adds a `views.themes_beta` route to avoid the `.dev`/`.min` extension being added automatically to frontend asset urls

**Miscellaneous**

- Fix double logging in `log()` function
- Add `--delete_import_on_finish` to `python manage.py import_ctf`
- Fix issue where `field_entries` table could not be imported when moving between MySQL and MariaDB

CHANGELOG.md

@@ -1,4 +1,4 @@
-# 3.5.0 / UNRELEASED
+# 3.5.0 / 2022-05-09
 
 **General**