[1.7] Use breadcrumbs instead of just "Back to course" link

Currently, pages related to a course show the course title as a link, to quickly jump back to the course home page.

This is "bad" for 2 reasons:

• There already is a "home" link in the upper right.
• Breadcrumbs would be far better

Using breadcrumbs is not that easy, as Drupal uses the paths to create breadcrumbs. But, we can provide a custom API (which tools can implement) to provide a path from the current page to the course home page.

Provide a real breadcrumb trail, to facilitate navigation when going several layers deep.

Current status

Opigno core now ships with a sub module called Opigno Breadcrumb. This module allows tools to provide a custom breadcrumb trail, allowing us to give users a simple, intuitive trail to navigate with.

Apps/tools that need implementing:

• Opigno Quiz App
• Opigno Poll App
• Taxonomy File Tree
• Opigno Video App
• Opigno Webex App
• Opigno Forum App

Tasks remaining:

• Need to create a new release for Opigno Core
• Need to create a new release for Platon