Adjust participant-room view

Customize the participant-room view so that the comment and feedback functions are separated to the contents and comments written by the user.

created branch 135-adjust-participant-room-view

added WIP and removed ToDo labels

assigned to @lmas60

added 1h of time spent at 2018-03-13

added ~1064 and removed WIP labels

added WIP and removed ~1064 labels

mentioned in merge request !94 (merged)

closed via merge request !94 (merged)

closed via commit 3448f2be

mentioned in commit 3448f2be