Eliminate dependency on cron jobs for sending mails

[krabina]

Feature request:

I have never used this, but according to the documentation, you would have to setup a cron job in order to execute a mail delivery on a date you set for a task.

I just recently was pointed by @hexmode to this extension: https://github.com/hallowelt/mwstake-mediawiki-component-runjobstrigger
As far as I understand it, this could be used by Semantic Tasks so a MediaWiki job would be created to send notification e-mails instead of a cron job. But I might be wrong.