feature request: absence approval configureable

[pkoevesdi]

I'm totally glad that with working hours plugin 1.16.0 we have a absence approval now, thank you for this!

Some wishes for further development:

• let us choose, which types of absence need approval at all (for instance vacation needs approval, sickness doesn't) *)
• let us choose, who can approve, including options "Vorgesetzter", "Rolle xx", "User xx", "Teamleader" etc., the latter options enable indepency of who is "Vorgesetzter".
  • best this also for each type of absence differently. So I'd suggest for each absence type to make it choosable who must approve, and one of the options is "nobody". This would fulfill first and second point together.
• make these settings user dependent. For instance, some employee's vacation needs to be approved by option x, some by option y, some need no approval at all.

*) use case: In our company we want to introduce an approval process for vacation, but not for sickness. Because sickness is not a decision of the company, the company can't judge about this, especially not the first 3 days, where no sick note from a doctor is needed.