Ability to block out annual leave/blackout days as unavailable time

Description

Annual leave/other leave/blackout days/onsite days should be removed from the resource planners as Unavailable time.

What are you trying to achieve

Where work is allocated across a timeline, the system currently averages this across the days within that timeline, if unavailable days (i.e. annual leave etc.) is removed from this calculation, the work will correctly be averaged either side of this unavailable time. Where unavailable time is still included in the calculation, this is giving an incorrect view of the hours allocated on the available working days.