* Slightly improve the media experience
- Use a grid to display the list of media
- Add icons for non-image media preview
- Paginate the gallery
- Add links to the gallery in the editor and in the profile settings to make it more discoverable when you need it
Fixes#432
* Allow video and audio tags in SafeString
Otherwise we can't display their preview, nor show them in articles
Also show controls by default for these two elements
* Show fallback images for audio and unknown files, to make them more visible
* Add a new constructor to SafeString when the input is trusted and doesn't need to be escaped.
And use it to generate media previews.
* Make it possible to insert video/audio in articles
* Password reset
* Various improvements and fixes for password reset
- Reorganize src/mail.rs to make it cleaner
- add a build_mail function
- only make the requests invalid after 2 hours
- avoid infintely-growing list of requests by deleting them once completed, or after 24 hours
- avoid sending many requests for the same user
- validate the password reset form
* Avoid locking so many times
Fix durations
* Remove old requests even if the current one is not valid
* Remove unused feature
* Also remove the custom_derive and plugin features while we are at it
* Forgot a 0 è_é
* Avoid panicking while owning a request lock
* Use master branch of lettre so that we can build with the latest OpenSSL
* Fix the debug mailer
