This is based on Julian's idea on bug 28026 where we could get rid of call_recursive by passing refs as arguments to call.
Test Plan:
1) Apply this patch
2) prove t/db_dependent/Koha/Plugins/Plugins.t
3) prove t/db_dependent/Koha/Plugins/Barcode_transform_hooks.t
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>