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...
Fixes bug where the resource module loads metadata for all files while
building course modinfo, even though it only needs the first file.
(This causes problems if you have ~10k files.)
Eloy Lafuente (stronk7)