attempts to fix routing issue when clicking the quiz button

Closes #192

See merge request arsnova/topic-cloud!103

Adds sanitizer to make dom cors access possible with observables

Closes #192

See merge request arsnova/topic-cloud!102

Revert "Merge branch '187-display-the-amount-of-active-users-for-a-session' into 'staging'"

See merge request arsnova/topic-cloud!100

This reverts merge request !99

Resolve "Display the amount of active users for a session"

Closes #187

See merge request arsnova/topic-cloud!99

Adds button to navigate to new quiz-now wall

Closes #188

See merge request arsnova/topic-cloud!98

merge 'tag-cloud-administration' into staging

See merge request arsnova/topic-cloud!96

Merge 'tag-cloud' into staging

See merge request arsnova/topic-cloud!97

Sometimes the tag cloud did a redraw unnecessarily
when joining the tag cloud via dialog.

[Ticket: #186]

Show gavel icon in participants room overview according to direct send setting

See merge request arsnova/topic-cloud!95