Add the unacknowledged coment counter to creators
Only query counter when neccessary

Introduce new role concept

Closes #233 and #315

See merge request arsnova/arsnova-lite!350

Forbid setting comment as read without using presentation mode

Closes #367

See merge request arsnova/arsnova-lite!357

Use flag to only show link to comment moderation stream when room is moderated
Fix bugs in settings

Add ack bool flag to comment for filtering and moderating

Add moderation icon to moderators room page component in preparation for blacklist/whitelist
Implement delete function

Have a user home where all visited and created sessions are in one list
Add icons for the room list to identify the role

Resolve "Embed a Youtube video on the home page"

Closes #287

See merge request arsnova/arsnova-lite!352

Merge branch '360-use-a-dynamic-search-field-that-opens-when-the-search-icon-is-clicked' into 'master'

Redesign seach-bar for mobile devices

Closes #360

See merge request arsnova/arsnova-lite!356

Add copy-to-clipboard button for room short id

Closes #354

See merge request arsnova/arsnova-lite!344

Add tooltips to login buttons

Closes #282

See merge request arsnova/arsnova-lite!353

Fix async handling

See merge request arsnova/arsnova-lite!355

The dialog should only be closed after the event got emitted.

Merge branch '366-place-the-session-id-in-the-header-of-the-question-list-view-in-both-roles-and-also-on-mobile-devices' into 'master'

Show session id also on mobile devices and for students

Closes #366

See merge request arsnova/arsnova-lite!354

add description to manifest

See merge request arsnova/arsnova-lite!351

wording

See merge request arsnova/arsnova-lite!349

change visibility icons

See merge request arsnova/arsnova-lite!348

wording

See merge request arsnova/arsnova-lite!347