Add a tool for admins to test that the outgoing mail configuration is valid.
This commit also adds the fa-file-text icon from font-awesome.
AMOS BEGIN CPY [eventstarttime,core_calendar],[task_starttime,core_admin] CPY [eventduration,core_calendar],[task_duration,core_admin] CPY [result,core_cache],[task_result,core_admin] CPY [database,install],[task_dbstats,core_admin] CPY [fail,install],[task_result:failed,core_admin] AMOS END