New: unified action and event with trigger name

htdocs/admin/prelevement.php

htdocs/core/class/notify.class.php

htdocs/install/mysql/data/llx_c_action_trigger.sql

htdocs/install/mysql/migration/3.0.0-3.1.0.sql

htdocs/install/mysql/tables/llx_c_action_trigger.key.sql

htdocs/install/mysql/tables/llx_c_action_trigger.sql

htdocs/langs/ar_SA/other.lang

htdocs/langs/ca_ES/other.lang

htdocs/langs/da_DK/other.lang

htdocs/langs/de_AT/other.lang

htdocs/langs/de_DE/other.lang

htdocs/langs/el_GR/other.lang

htdocs/langs/en_US/other.lang

htdocs/langs/es_ES/other.lang

htdocs/langs/fa_IR/other.lang

htdocs/langs/fi_FI/other.lang

htdocs/langs/fr_FR/other.lang

htdocs/langs/is_IS/other.lang

htdocs/langs/it_IT/other.lang

htdocs/langs/nb_NO/other.lang