remove points for answer options from the ui and use defaults

use only one bool to determine mode

Shrink code, bugfix logic in creator's multiple choice content, add $event to all "button"-methods to prevent problems if it is interpreted as submit, add console.log in submit-method for testing, add reset-method to set all values to default after submit

Implemented answer-edit component to be used with content-choice-creator component (template and logic)

Add logic for choice-creator-component to check for empty answers and to check if there is more then 1 true answer in single-choice-mode

Rename identifiers

Rename models