Locations for everyone

This exposes locations as a separate thing from CommTrack. Actual locations are still really only useful if you have CommTrack turned on, but this is step one of getting Sheels monster feature out.
did this actually move out of the commtrack settings? that seems a little confusing if so. also is inconsistent with https://github.com/dimagi/commcare-hq/pull/4797/files#diff-1d8a6e2b00dbb7850a4c1bfde042d6e8R338 which seems to imply it's still on the commtrack settings