Merge remote-tracking branch 'Upstream/develop' into develop-hrm3

CONTRIBUTING.md

dev/mail/source_email_from_thirdparty.txt

dev/skeletons/skeleton_card.php

htdocs/admin/mails.php

htdocs/admin/modules.php

htdocs/admin/oauth.php

htdocs/comm/action/index.php

htdocs/comm/askpricesupplier/card.php

htdocs/comm/propal.php

htdocs/commande/card.php

htdocs/compta/deplacement/card.php

htdocs/compta/facture.php

htdocs/compta/facture/contact.php

htdocs/compta/facture/fiche-rec.php

htdocs/compta/facture/mergepdftool.php

htdocs/compta/facture/prelevement.php

htdocs/compta/paiement/card.php

htdocs/compta/paiement/cheque/card.php

htdocs/core/actions_sendmails.inc.php

htdocs/core/class/CMailFile.class.php