Feature/follow up questions

[mmoila]

• New feature follow-up sections
  • Can be added after numeric, slider, radio and checkbox questions
  • Follow-up sections for a question can be reordered
• New feature conditional pages
  • Any page except the first one in the survey can be a conditional page
  • Conditions are based on previous pages question answers
  • Pages can be reordered, but reordering will clear conditions that don't fit the new page order

Closes #102

[jpeltzi]

Submitting the survey doesn't seem to work when the last page is conditional and the condition is not met.

The "Cancel" button might not be visible when changing the type of a follow-up question.

[ossitammi]

When the survey is initially loaded, this file throws an error:

[mmoila]

This was caused by saved follow-up section without defined section type. Fixed by setting radio question as default type for follow-up sections.

[ossitammi]

Also, if the user focuses on the answer field of the question and then clicks somewhere else without answering, an exception is thrown. At least this happened when the leading question was numeric.

Error:

[ossitammi]

Correction: The error is thrown and the page crashes even if you try to insert some value on the answer field

[mmoila]

Couldn't really reproduce but added a fix to prevent these in the future.

[ossitammi]

Changes needed to finish code review.

• The SurveyAnswerContext causes errors that crashes the page.
• The follow up questions are missing from the translations