Allow startup priority by RegionType 🔼

In order that grid landing region and private (read: paid-for) regions come up before freebies and water regions.

reported=2020-02-10 10:17:39

reporter=Taylor

priority=low

category=Feature

severity=feature

resolution=fixed

2021-06-30 20:09:42 onefang: At the moment RegionType is very ad hoc.  I'm leaning more towards just listing sims in order you want them to start up.  So I can put ARSE last, and no one has to wait hours for it to come up for example.