Print farm shift calculation#228

Improved print plan queueing.

For example, you can set up that the employee’s shift is from 8:00 to 18:00.
Three prints are scheduled to be printed, each of them takes 6 hours. So first print is started at 8:00, finishes at 14:00 and another is started immediately, but it finishes at 20:00. The last print can only be started at next day 8:00, so the total time would be 3*6h+12h (time during which noone can start the print). This could well be shown in the Gantt chart and long term print planning would be many times easier.

I know that having automatic print removal makes this feature obsolete, but this could still be used for example filament or nozzle change planning.

oh yeah for sure… this is much needed
i posted a similar and easier suggestion that can be implemented before this more complex queueing goes into production
https://suggestions.simplyprint.io/234

but yes i want this plan queue badly