refactor questionnaire editor to sfc, fixes #4303

app/views/questionnaire/edit.php

lib/models/Freetext.php

lib/models/LikertScale.php

lib/models/QuestionnaireInfo.php

lib/models/RangeScale.php

lib/models/Vote.php

resources/assets/javascripts/bootstrap/dialog.js

resources/assets/javascripts/bootstrap/questionnaire.js

resources/assets/javascripts/bootstrap/vue.js

resources/assets/javascripts/lib/dialog.js

resources/assets/javascripts/lib/questionnaire.js

resources/assets/stylesheets/scss/forms.scss

...ces/vue/components/questionnaires/QuestionnaireEditor.vue