Resolve "Room creation - form submission"

Closes #81

See merge request swtp-block-ws17/arsnova-angular-frontend!67

Resolve "Fix - AppRouting"

Closes #80

See merge request swtp-block-ws17/arsnova-angular-frontend!66

Resolve "participant home screen - room logic"

Closes #42

See merge request swtp-block-ws17/arsnova-angular-frontend!64

Add errorpage for not existing room-links

Add room logic so that the participant-room view displays the current-room information instead of test data

Resolve "creator home screen - html template (room)" 2nd try

Closes #58

See merge request swtp-block-ws17/arsnova-angular-frontend!62

Resolve "participant home screen - html template"

Closes #20 and #22

See merge request swtp-block-ws17/arsnova-angular-frontend!63

Reformat join room component
Reformat participant home screen component
Add some basic scss formats