feat: initial import of WorkingTitle flight plan manager

[Benjozork]

Fixes #939
Fixes #1388

Summary of Changes

Flight plan manager

• Initial code import
• Remove dependency on "MSFS" pseudo-module, use ambient type declarations for MSFS globals instead

Avionics

• Fix navigation display
  • Instrument loading
  • Share flightplan correctly (often goes out of sync)
  • No line drawn for approach waypoints
  • Do not draw line after discontinuities
• Fix upper ECAM

MCDU/FMGC

• Fix F-PLN page
  • Approach waypoints being shown twice
  • Discontinuities
    • Display
    • Clearing
  • Allow deleting fixes in STARs
  • Fix various LSK and scrolling issues
• Fix arrival selection page
  • UNTITLED screen on load
  • UNTITLED screen when an approach transition is selected
  • UNTITLED screen when a via is selected
• Get rid of / hide RWXXX fixes
• Adapt fix naming to Honeywell FMGS
  • (VECT) -> MANUAL
  • (<altitude>) -> <altitude>
  • others
• Properly add FA legs to departures without SIDs
• Do not allow selection of "fake" SIDs (ref. @tareksabet)
• Support compressed flight plans

Autopilot

• Integrate LNAV code

Screenshots (if necessary)

References

Additional context

Discord username (if different from GitHub):

Testing instructions

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[St54Kevin]

This seems HUGE. Thanks for addressing it!

[pepperoni505]

This seems HUGE. Thanks for addressing it!

Please avoid unnecessary conversations in pull requests.

[Benjozork]

Closing as it's being done in the autopilot-fpm branch now