A Promise is used to delay `emit` calls until the connection is
established. This fixes a race condition. The `socket` object is no
longer accessed directly outside of `ARSnova.WebSocket`.

Update translations based on new implementation

See merge request !89

`document.exitFullscreen` is no longer called when fullscreen is not
active.

Spec: "If doc is not fully active or doc’s fullscreen element is null,
then reject promise with a TypeError exception and return promise."
(https://fullscreen.spec.whatwg.org)

Fix abstentions for grid questions

See merge request !88

Daniel Gerhardt authored 5 years ago and Daniel Gerhardt committed 5 years ago

Fixes arsnova#104.

Rename (un)sorted list to (un)ordered list

See merge request !87

Fixes arsnova#105.

Fix rendering of code with <hlcode>

See merge request !86

Markdown generated for <hlcode> did not conform to the Commonmark spec
and was not compatible with marked 0.6+.

Fixes arsnova#101.
Fixes GH-89.

An info message for the non-functional flashcard CSV import has been
added.

Recent iOS version should be able to handle the export and import w/o
problems.

Use a consistent format for filenames:
* arsnova-session-<session short name>-<timestamp>.json
* arsnova-contents-<timestamp>.csv
* arsnova-flashcards-<timestamp>.csv
* arsnova-answerstats-<timestamp>.csv
* arsnova-textanswers-<timestamp>.csv

Refactor CSV export

See merge request !85

Delimiter and excel settings are now available when exporting answers.
This also fixes the regression that no delimiter was used at all.

See commit 6774fd5c.

Piwik is now called Matomo.

The last auth service button would not render in some specific cases.

Margins were set incorrectly if different roles had been enabled for for
auth services.

* Replace Google and Twitter icons with updated versions
* Imporove positioning
* Add default icon for OIDC login

This feature was lost with the transition to scalable font icons in
version 2.1.

Admin delete session

See merge request !84

Admins can now delete any session by its key.

Readd support to create copies of pool sessions

See merge request !83

A new API endpoint is used to create a copy instead of locally exporting
and importing the session (2.3 behavior).