If a H5P content-type is disabled:
- The content bank won't display existing contents having it as a
main library.
- The content bank won't allow to create new contents using it.
All the setup/teardown/pre/post/conditions template methods
now are required to return void. This was warned with phpunit 7
and now is enforced.
At the same time, fix a few wrong function names,
provider data and param types, return statements...