chore(a380x): port fcu and make fixes

[tracernz]

Fixes #8913

Summary of Changes

Ports the FCU. Steps:

• Copy code across essentially unmodified and get working.
• Add type information with the actual types used. The type errors are now all real.
• Split some systems code from UI code and refactor to MSFS avionics style.
• Show pointer/VOR/ADF labels on the display depending on what's selected.
• Fix baro pre-select forgetting the pre-selected value.

Future work:

• Port the rest of the components to MSFS avionics style.

This also prepares for ADR work I am doing for the A32NX (and in relation to the FMGC/FCU work Lukas is doing).

Screenshots (if necessary)

References

Additional context

Discord username (if different from GitHub):

Testing instructions

Test all functions of the FCU except metric altitude (not implemented).

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 or flybywire-aircraft-a380-842 download link at the bottom of the page

[Saschl]

LGTM. You already added all the TODOs and FIXMEs so I'm happy when you are

Reviewed before ready to review.