This introduces a new per-user preference called
"Auto-play animated GIFs", which is enabled by default. When a
user disables this setting, gifs in toots become click-to-play.
Previews of animated gifs were changed to display the video play
button so that users can distinguish them from regular images.
This setting also affects account avatars in the detailed account
view, which was changed to use the same hover-to-play mechanism
that is used for animated avatars in timelines.
Fixes#1652
* Add recovery code support for two-factor auth
When users enable two-factor auth, the app now generates ten
single-use recovery codes. Users are encouraged to print the codes
and store them in a safe place.
The two-factor prompt during login now accepts both OTP codes and
recovery codes.
The two-factor settings UI allows users to regenerated lost
recovery codes. Users who have set up two-factor auth prior to
this feature being added can use it to generate recovery codes
for the first time.
Fixes#563 and fixes#987
* Set OTP_SECRET in test enviroment
* add missing .html to view file names
to only those from local users; Add link to "extended information" to
getting started in the UI; Add defaults for posting privacy; Change
how publish button looks depending on posting privacy chosen
