feat(a380x/mfd): Vertical Revision speed limit modification

[BravoMike99]

Fixes #9841
Fixes #8962

Summary of Changes

Adds modification of speed limit through vertical revision page.
Fixes delete altitude & speed constraint button not generating a temporary flightplan.

Screenshots (if necessary)

References

Additional context

Discord username (if different from GitHub):
bruno_pt99

Testing instructions

Program a flight plan of your choice on the FMS.
With an altitude constraint entered on a waypoint, press the "DELETE ALT CSTR" button on the ALT VERT REV page. After doing so, verify a TMPY FPLN is generated and that the constraint is deleted after inserting it.
Repeat the previous process but for a speed constraint on the SPD VERT REV page.
On the MFD, select a waypoint with a climb speed constraint or with no constraint at all (if on the ground) & access the SPD VERT page. "CLB SPD LIM" should be shown like the above picture with a 250K 10000feet value (if above transition altitude, it will be shown as flight level).
Attempt to delete the SPD LIM via the input fields or the button. A temporary flight plan is generated and after insertion the "SPD LIM" disappears from the F-PLN page and the calculated speeds are no longer limited by such restriction.
With a previously deleted speed limit, access the vert revision page again and insert a value in the speed or altitude fields. After doing so, the other should be populated with 250kt if an altitude was inserted or 10000 feet if a speed was inserted. The fields should become bigger after a manual entry.
Play around with editing the speed limit fields and verify the speed limit is correctly updated on the PERF CLB (only visible on the ground currently) and on the F-PLN page.
Repeat the previous process but for the descent speed limit, In order to edit the descent speed limit the waypoint in question needs to have a descent speed constraint or the FMS must be in the descent phase. (You can always add a descent constraint yourself)
Verify that the magenta speed bug & the autopilot respect the speed limit after a manual edition and that the speed is not limited by it after deletion.

How to download the PR for QA

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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

[flogross89]

nice work, thanks!