feat(a380x/mfd): Add DATA/WAYPOINT page

[Slightlyclueless]

Summary of Changes

Add the waypoint page under the data header

Screenshots (if necessary)

References

Additional context

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Testing instructions

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[tracernz]

Suggested change

	getAllStoredWaypoints(): PilotWaypoint[] {
	if (this.storedWaypoints === undefined) {
	return [];
	} else {
	return this.storedWaypoints;
	}
	}
	getAllStoredWaypoints(): PilotWaypoint[] {
	return this.storedWaypoints ?? [];
	}

Could be better to just return undefined though rather than allocating an array every call when it's empty.

[Slightlyclueless]

Hmmm, I dislike returning undefined for elements like this. This shouldn't be called that often so I feel like the allocation is not going to be that bad (this may be C/Rust brain thinking where an allocation for that slice would be tiny)

[tracernz]

Then why not have this.storedWaypoints always an array instead? If this is being called every time the page updates it's allocating quite a lot of unneeded objects across a flight. It's death by a thousand cuts with GC pauses = microstutter.

[Slightlyclueless]

Then why not have this.storedWaypoints always an array instead

Just checked, it already is (Line 61). So this function doesn't need any nullish coaliescing at all, it can just return the array