[x] On questionnaire close save current answer. Currently answers are only saved when pressing the next or previous button.
[x] When the questionnaire is closed while showing summary and then reopened the last question will be shown. This is because a questionnaire doesn't know/implement the summary. Decide whether to always restart at the beginning when reopening a questionnaire or somehow store and restore the state when the summary is reached.
[x] Restoring the duration input state has not been tested yet.
TODO: