Author: Srdjan
MDL-70975 task: Support for running adhoc tasks by id
* CLI adhoc_task.php: new option --id
* cron::run_adhoc_task($taskid) for running tasks by id
* core\task\manager::get_adhoc_task($taskid) for retreival/locking
http://git.moodle.org/gw?p=moodle.git;a=commit;h=9405b5aa6d1d7fdf7f366a0fcc538aa4e0c4292b
http://github.com/moodle/moodle/commit/9405b5aa6d1d7fdf7f366a0fcc538aa4e0c4292b
+ 4.2 en [invalidtaskid,core]
+ 4.2 en [invalidtaskclassname,core]
+ 4.2 en [wontrunfuturescheduledtask,core]