Resolve "content types (classes)"

Closes #109

See merge request swtp-block-ws17/arsnova-angular-frontend!86

Select first content (due to array as return paramter)

Remove unnecassary api call for room to get room id (?!)

Re-arrange AnswerOptions (code style)
Add constructor for content
Refactor ChoiceContent
Refactor TextContent

Resolve "content types (classes)"

Closes #109

See merge request swtp-block-ws17/arsnova-angular-frontend!83

Resolve "content creation (text) followup"

Closes #100

See merge request swtp-block-ws17/arsnova-angular-frontend!75

Add constructors for all contents

Resolve "See reed comments (participant)"

Closes #130

See merge request swtp-block-ws17/arsnova-angular-frontend!77

Resolve "Filter content answers"

Closes #122

See merge request swtp-block-ws17/arsnova-angular-frontend!80

Merge branch '131-follow-up-from-resolve-creator-home-screen-room-logic-room-room-details-modification' into 'master'

Resolve "Follow-up from "Resolve "creator home screen - room logic (room)"" - room details modification"

Closes #131

See merge request swtp-block-ws17/arsnova-angular-frontend!79

Resolve "Content List Filter for Items"

Closes #124

See merge request swtp-block-ws17/arsnova-angular-frontend!78

When you click update in modification popup it will now update the room-detail page and will not go back to the creators-home-screen