2.3.0 (#1248)

2.3.0 / 2020-02-17
==================

**General**
* During setup, admins can register their email address with the CTFd LLC newsletter for news and updates
* Fix editting hints from the admin panel
* Allow admins to insert HTML code directly into the header and footer (end of body tag) of pages. This replaces and supercedes the custom CSS feature.
    * The `views.custom_css` route has been removed.
* Admins can now customize the content of outgoing emails and inject certain variables into email content.
* The `manage.py` script can now manipulate the CTFd Configs table via the `get_config` and `set_config` commands. (e.g. `python manage.py get_config ctf_theme` and `python manage.py set_config ctf_theme core`)

**Themes**
* Themes should now reference the `theme_header` and `theme_footer` configs instead of the `views.custom_css` endpoint to allow for user customizations. See the `base.html` file of the core theme.

**Plugins**
* Make `ezq` functions available to `CTFd.js` under `CTFd.ui.ezq`

**Miscellaneous**
* Python imports sorted with `isort` and import order enforced
* Black formatter running on a majority of Python code

export.py

@@ -12,14 +12,14 @@ with app.app_context():
     backup = export_ctf()
 
     if len(sys.argv) > 1:
-        with open(sys.argv[1], 'wb') as target:
+        with open(sys.argv[1], "wb") as target:
             shutil.copyfileobj(backup, target)
     else:
         ctf_name = config.ctf_name()
         day = datetime.datetime.now().strftime("%Y-%m-%d")
         full_name = "{}.{}.zip".format(ctf_name, day)
 
-        with open(full_name, 'wb') as target:
+        with open(full_name, "wb") as target:
             shutil.copyfileobj(backup, target)
 
         print("Exported {filename}".format(filename=full_name))