Tutor

- [Security] Fix CustomTagModule mako template injection.
- [Improvement] Move all plugins outside of the tutor repo.
- [Bugfix/Improvement] Add all plugins (with data) into binary bundle (242).

- [Bugfix] Fix missing templates in bundled plugins.
- [Bugfix] Enable HTML certificate view.

- [Bugfix] Fix missing patches from minio plugin (thanks Wejie!).

- [Feature] Modify ``createuser`` commands to define a password from the command line.
- [Improvement] Better YAML value parsing from the command line.
- [Feature] Add `dev exec` command.
- [Bugfix] Fix incorrect notes settings definition.
- [Improvement] Make it possible to start/stop/reboot a selection of services.
- [Improvement] Add `local/k8s reboot` commands.
- [Improvement] Add `-U/--unset` option to `config save`.
- [Bugfix] Fix insecure static asset loading when web proxy is enabled.
- [Improvement] Rename `SECRET_KEY` configuration parameter to `OPENEDX_SECRET_KEY`.
- [Improvement] Add support for SSL and TLS in external SMTP server (231).
- [Bugfix] Fix missing video transcripts in LMS (229).
- [Improvement] Make it possible to enable/disable multiple plugins at once.
- [Improvement] Add a few local and k8s patches for plugins.

- [Bugfix] Add pre-init hook for correct initialisation of minio.

- [Security] Apply certificate XSS security patch.