Add IAU observatory code preference
Description
Adds a preference to set an IAU observatory code
Changes Made
Code is obeyed by conesearch command and the GUI solar system object search. Validation is done to check that a 3-character code is passed, and the settings GUI only allows a 3-character entry anyway.
Related Issues
Addresses a point listed for triage in #1154
Merge Request Checklists
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Code follows project coding guidelines and its checklist -
I have submitted a MR in the documentation repository if required -
I have updated Changelog and NEWS, listing the related issues. (I'll do these last minute once everything else is agreed, otherwise it just creates work managing conflicts.) -
If my MR introduces new dependencies, I have run all the CIs, even the optional (manual) jobs.N/A
Edited by Adrian Knagg-Baugh