Refactor how section ordering is handled (#1837) ...

* Extract template customizations into own controller

* Refactor Template model methods

* Fix view logic in draggable sections

* Add button for customising phase

* Fix rubocop violations in GuidanceService

* Rename GuidanceService to GuidancePresenter

* Fix bug in phase preview order sections

* Refactor preview action/controller code

* Fix Section ordering in various views

* Fix rubocop violations

* Fix bug forcing Phases to be modifiable

* Fix broken tests

* Update method to check if section is draggable

* Extract copy action into its own resource

* Extract customization transfers to own controller

* Remove redundant routing condition

* Fix Rubocop violation issues

* Change condition for section draggable

* Refactor instance variable in PlansController

* Fix broken tests

* Add test support for 'de' locale

* Fix merge issue in plans controller

* Fix broken specs in plan#request_feedback

Issue 532 (#1847) ...

* Replaced instances of `raw` with `sanitize`

* Updated Brakeman ignores

* Remove unnecessary sanitation

* Add support for TinyMCE tags

Fixes #1184 . ...

- example_answer/guidance test expected Integer, received String from enum
- added a few `.chomp.strip`s to fix naughty user-entered texts
- changed "Created by the %{app...}" to "Created by the %{app...} service" as it didn't look right for some service names

updates to pdf and docx formatting for public templates and plans ...

minor tweaks

fixes to public dmp pdf format ...

updated formatting of public templates PDF and DOCX

created template pdf pages, moved public pages to new controller, revised auth for public pages