Fixed models & schema annotations

Changes following migrations

Fix for ensuring that Questions that are option based must have atleast one non-blank text entry. ...

- Validation added for option based questions to ensure text field non-blank.
    - Validation message OPTION_PRESENCE_MESSAGE added to app/models/concerns/validation_messages.rb.
    - Added ':allow_nil => true' to
            delegate :option_based?, to: :question_format, :allow_nil => true
     in Question model to prevent NoMethodError if question_format is nil.

    Fix for #1725

Update asset structure with webpacker gem

Refactor how Template upgrade customization works (#1856) ...

* Refactor how Template upgrade customization works

- Added position_in_parent to child-records Phase, Section, and Questions
- Extracted upgrade_customization! into its own service object

wip: rebasing on development

wip: pushing to Ghub

wip: Template upgrade customisation service working

Add migration to update versionable_id for records

* Fix bug in org swaps test

Test was failing because JS wasn't executing fast enough in test browser

* Refactor how locales are set in specs

* Fix bug in plan exports caused by git merge

The routes weren't merged properly which seems to have caused a regression error

* Add documentation for SectionSorter

* Update rubyzip and re-instate Bundle Audit

This was disabled because it was failing the Travis CI script. Since there wasn't a
new version of the rubyzip gem to upgrade to, we couldn't turn the error off.

* Add length constraints to versionable_id

* Add length constraints to versionable_id

* Fix bug in ActsAsSortable module

... I have no idea why those issues haven't popped up before now!?

* Fix random bug in I18n

* Move versioning ID migration into own rake task

Add schema structure to factories files

Add specs for completing a Plan

Add specs for all models

Adding fixtures