feat(navdata): allow airports to be used as fixes

[tracernz]

Fixes #[issue_no]

Summary of Changes

• Allows airports to be used as fixes in instrument procedures. This seems to be more common in the LIDO data MSFS uses now.
• Fixed an issue where airports referenced as fixes could not be loaded in MSFS2020 (airports do not have region codes in 2020, but they do when referenced as fixes in procedure legs).

Screenshots (if necessary)

References

Additional context

Discord username (if different from GitHub):

Testing instructions

The proc I tested this with won't load for a different reason at the moment... so don't have a good way to test.
Use MSFS default navdata. Try EWR5 SID out of Newark, make sure it's selectable and loads.
Test and make sure some instrument procedures you normally use load okay, and look good on the ND in plan mode.

How to download the PR for QA

Every new commit to this PR will cause new A32NX and A380X artifacts to be created, built, and uploaded.

1. Make sure you are signed in to GitHub
2. Click on the Checks tab on the PR
3. On the left side, find and click on the PR Build tab
4. Click on either flybywire-aircraft-a320-neo, flybywire-aircraft-a380-842 (4K) or flybywire-aircraft-a380-842 (8K) download link at the bottom of the page

[BravoMike99]

Dev Team QA Report

Discord Username : bruno_pt99
Object of testing : #9792
Aircraft : A32NX
Tier of Testing : 1
Date : 25/01/2025

Testing Process:
Tested in 2020:
Loaded EWR5 SID, checked it is selectable and loads ✔️
Loaded a few procedures such as LPPT LAZET1A, IXIDA1N & LPPR ABLEG6C and verified they load & are displayed correctly ✔️

Testing Results:
Passed

Media: