[ticket/12298] Template Event memberlist_view_contact_before/after

add template event memberlist_view_contact_before
and memberlist_view_contact_after

PHPBB3-12298
Merge remote-tracking branch 'prosk8er/ticket/12298' into develop-ascraeus

* prosk8er/ticket/12298:
  [ticket/12298] Template Event memberlist_view_contact_before/after