fix: Make form editable with keyboard

[Chartman123]

This fixes #416 by always showing the edit mode for all fields in Edit/Create view

To-Do:

• Fix tabbing from multilple choice questions to next question. Probably due to switching between normal Input and AnswerInput.vue (also tracked in Focus order issues #1256)
• Focus after adding question not in title
• emit onInput event after creating a new option only works after first input

[Chartman123]

@susnux @jotoeri While reviewing, please especially have a closer look at my second and third commit. They make the code work the way I wanted, but I'm not sure if there weren't better solutions :)

[susnux]

Code looks good, one comment.
But it seems that adding new options on pressing enter is broken now

[Chartman123]

But it seems that adding new options on pressing enter is broken now

@susnux Yes, thats true. I will have another look at this...

Do you have an idea how I can fix the problem that new options will only be added to the database when you have at least more than one input events on a new option field? I couldn't find any working solution myself by now...

[susnux]

Works but one comment