adjust some settings

See merge request arsnova/arsnova-lite!245

revise Manifest

See merge request arsnova/arsnova-lite!244

Update room-participant-page.component.scss

See merge request !243

Update room-creator-page.component.scss

See merge request arsnova/arsnova-lite!242

Update content-list.component.scss

See merge request arsnova/arsnova-lite!241

Update present-comment.component.scss

See merge request arsnova/arsnova-lite!239

Update comment.component.scss

See merge request arsnova/arsnova-lite!238

Update comment.component.scss

See merge request arsnova/arsnova-lite!237

Update present-comment.component.scss

See merge request arsnova/arsnova-lite!236

Allow user line break with css directive

Closes #272

See merge request arsnova/arsnova-lite!227

Update comment.component.scss

See merge request arsnova/arsnova-lite!234

Resolve "Improve Service Worker strategy"

See merge request arsnova/arsnova-lite!231

Resolve "Use material dark theme colors"

Closes #284

See merge request arsnova/arsnova-lite!233

Resolve "Highlight the voted icon even more"

Closes #278

See merge request arsnova/arsnova-lite!232

Update en.json

See merge request arsnova/arsnova-lite!230

Update en.json

See merge request arsnova/arsnova-lite!228

Allow lecture guest session

Closes #262

See merge request arsnova/arsnova-lite!226

Manage overflowing comment presentation view

Closes #247

See merge request arsnova/arsnova-lite!225