* Add \Froxlor\Cron\TaskId for fixed task id naming
* Replace Cronjob::inserttask numbers with \Froxlor\Cron\TaskId constants
* Use TaskId in Froxlor\Cron\System\TasksCron
* Use TaskId in Froxlor\System\Cronjob,
simplify getOutstandingTasks.
Rename lng['tasks'] cronjob task description.
WARNING: DELETE_DOMAIN_PDNS, DELETE_DOMAIN_SSL now use %domain%
* Remove Froxlor\System\Cronjob type 3 check