Allow a priority to be set on build plans, to allow for automatic build queue placement

We've got a highly used Bamboo instance where we're hitting our 100 remote agent limit.
We have plans to obtain further licenses, but we'd also like the ability to have the builds in the queue be automatically prioritized so some of the less-important plans/jobs can be pushed down the queue if a more important build/job is added to queue.

If two builds with the same priority are added to the queue, then it's first-come-first-served.

Priority could be defined on a pretty basic scale of:
"High","Medium","Low", with all builds being defined as "Medium" by default.