Add ResetVote functionality

Closes #226

See merge request arsnova/arsnova-lite!202

Read previous Vote on comment loading

Closes #222

See merge request arsnova/arsnova-lite!201

Send ResetVote command on reclicking voting buttons

Add vote service for HTTP find request to get users votes
Pass each vote to comment component

Proxy change: add /api/vote -> comment-service

Only output stomp debug when env var is set

See merge request arsnova/arsnova-lite!200

Minor fixes

Closes #219, #237, #250, and #251

See merge request arsnova/arsnova-lite!199

Improve filtering/sorting

Closes #238 and #239

See merge request arsnova/arsnova-lite!198

Several fixes

Closes #224, #227, #228, #229, and #231

See merge request arsnova/arsnova-lite!197

Roadmap

See merge request arsnova/arsnova-lite!196

Several fixes

See merge request arsnova/arsnova-lite!194

Fix view of comment presentation

Closes #214

See merge request arsnova/arsnova-lite!193

Resolve "comment view is over the timestamp in student mobile view" + 2 more fixes

Closes #215, #218, and #216

See merge request arsnova/arsnova-lite!192

Fix icon name

See merge request arsnova/arsnova-lite!191

Pwa improvements

See merge request arsnova/arsnova-lite!190