Task Duration Auto Updates when start date and deadline are entered mannually

[#1]

Building out schedules is time consuming. We are working with project templates that have some basic durations built into them to keep the order and predecessors intact. When the requests are converted into projects and we are needing to adjust the schedules to make them live it is time consuming to have to guess at the duration rather than just enter in the start and deadline of the tasks and have the schedule roll.