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...
It is still used widely in the plugins that would stop working suddenly
without being warned via a debugging message. We must keep it forever as
an alias for the wwwroot.
Eloy Lafuente (stronk7)