Resolve "participant home screen - room logic"

Closes #42 (closed)

Proposed changes

• Added back button to participant-room view
• Added room logic so that the participant-room view displays current-room information instead of test data
• Added loading-spinner and error page for unavailable room

For testing

• Login as participant, join a room and check if you see the correct room-informations
• Click on the 'back'-button should go back to the participant-home-screen view
• By entering route to not existing room the app should show an error

added 1 commit

• f7a42a6c - Add loading spinner

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changed the description

added 1 commit

• d0ab08d9 - Adjust participant-room view width to 100%

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added ready for review and removed ~1064 labels

tested successfully

added 20 commits

• d0ab08d9...372a6d09 - 15 commits from branch master
• 68ea3644 - Add goBack button to the participant-room view
• b746b541 - Add room logic so that the participant-room view displays the current-room…
• 0f879a39 - Remove useless test code
• 52545eb8 - Add loading spinner
• 95472cbc - Adjust participant-room view width to 100%

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added 1 commit

• a5676e78 - Fix code style

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resolved all discussions

mentioned in issue #82 (closed)

merged

mentioned in commit d0ba9e5c