Mavlink: update to latest ArduPilot/mavlink

[christianpetri]

Sync MAVLink message definitions from the latest ArduPilot/mavlink and regenerate the Mission Planner MAVLink bindings.

Summary:

• Update ExtLibs/Mavlink/message_definitions/*.xml from ArduPilot/mavlink master.
• Regenerate ExtLibs/Mavlink/Mavlink.cs and ExtLibs/Mavlink/mavlink.lua.
• Picks up the renamed MAG_CAL failure enums (MAG_CAL_FAILED_*) from common: rename/add MAG_CAL_STATUS failure enums to FAILED_* + RESIDUALS_HIGH mavlink/mavlink#2478.

Generator fix (ExtLibs/Mavlink/pymavlink/generator/mavgen_cs.py):

• Also clean newlines/CRs from entry.param[i].description before rendering.
• Upstream common.xml now contains MAV_CMDs whose <param> text spans multiple lines (e.g. new DO_FIGURE_EIGHT, promoted NAV_ARC_WAYPOINT).
• The vendored C# generator already ran cleanText on enum/entry descriptions but never on param descriptions, so those newlines landed inside single-line ///<summary> and [Description("...")] strings and broke the C# parser.
• The same convention (cleanText on all human-readable text) is applied consistently now.

Verification:

• dotnet build MissionPlanner.csproj -c Debug succeeds with 0 errors (pre-existing warnings unchanged).

Notes:

• Mechanical bump + minimal 2-line generator fix required to make the regen compile; all changes remain under ExtLibs/Mavlink/, matching prior Mavlink: update commits.
• Follow-up code/test changes that adopt the new MAG_CAL_FAILED_* enum names will be made in a separate PR.

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AI-assisted: prepared with the help of GitHub Copilot (agent mode). All changes were reviewed and locally compiled by the author before submission.

[christianpetri]

@peterbarker

[peterbarker]

@christianpetri I'm not a maintainer here.

I would suggest that -11,500 lines / +15,5000 lines is a fair indication of "wrong", however.

[christianpetri]

Closing in favour of #3750, which contains only the minimal change needed: the \MAG_CAL_STATUS\ enum update from mavlink/mavlink#2478 applied to \common.xml\ and the corresponding \Mavlink.cs\ enum block — 2 files, 1 commit.