Resolve "comment creation - participant html formular" 2nd

Closes #50

See merge request swtp-block-ws17/arsnova-angular-frontend!33

Resolve "creator home screen - html template (list)"

Closes #47

See merge request swtp-block-ws17/arsnova-angular-frontend!35

Resolve "content creation - Datenhaltung"

Closes #17

See merge request swtp-block-ws17/arsnova-angular-frontend!29

Resolve "room joining - html template"

Closes #18

See merge request swtp-block-ws17/arsnova-angular-frontend!36

Correct path after login
Correct paths in room list

Add creator home screen component
Add creator home screen route

Resolve "Room model, service, logic & view"

Closes #19

See merge request swtp-block-ws17/arsnova-angular-frontend!30

Now subscribing to route params and reloading data when params change as the component
didn't show the new data when navigating to another room detail page.

Add room component
Remove unused room logic from component
Add room route

Resolve "Re-check template layout"

Closes #73

See merge request swtp-block-ws17/arsnova-angular-frontend!32