IdStory Identity Manager

This component can transfer simple repeated task request to cron expression, which you can see in the visualisation in the bottom part of my component.
It would be nice to select first minute of every X minute by minute selector only or ideally connected with scheduled start because of better understanding for users. There is hour and minute selector even when selecting every minute, because I suppose that there will be less UX problems when implementing scheduled first start.
I added warning when trying to select last three days in month of every month repetition, because cron will run only when specified day of month is in actual month. I copied color for warning icon from role icon, cause I was not able to find any variable for commonly used colors, do we have any?
I wrote tests for creating cron expression compared with correct expression.
I also did simple documentation, If you miss something in the docu I can simpy complete it after your review.
I did rebase so I hope that link for branch is OK.

https://github.com/bcvsolutions/CzechIdMng/tree/phanak/882-scheduler-by-calendar

This feature is implemented, review will be included to parent task.