make numWorkers user selectable #287
Description
right now default number of workers is NCPUs-1 https://github.com/NREL/OpenStudio-PAT/blob/develop/app/app/project/osServerService.js#L54
with cpus having more cores, this creates a situation where it takes 15+ min for local server to start. It would be better if this was a user input from the server tools drop down.