MSP sync with IPF + poshold local targets

[xznhj8129]

This is the part 2/3 of syncing MSP capabilities with IPF ops, pull is based on #11147

New Features:

• MSP2_INAV_FLIGHT_AXIS_ANGLE_OVERRIDE (8726): set per-axis angle overrides (roll/pitch/yaw) via override mask; clamped to angle limits; feeds MSP RC override path.
• MSP2_INAV_FLIGHT_AXIS_RATE_OVERRIDE (8727): set per-axis rate overrides (roll/pitch/yaw) via override mask; clamped ±2000 dps; feeds MSP RC override path.

These two mirror the IPF axis override and are only active when MSP RC OVERRIDE mode is active; require updating at 5HZ or they will clear, this ensures no lockout. This allows you to directly override and control the angle or rate in any mode via MSP.

• MSP2_INAV_SET_LOCAL_TARGET (8728): In GCS nav, sets the local body-relative position target in cm
• MSP2_INAV_LOCAL_TARGET (8729): readback of posControl.desiredState (pos/vel/yaw/climb) in NEU/cm/cm/s/centideg.

These allow setting and reading directly the desired state in a sort of Local poshold control. So if you are in poshold, setting x_cm=100 will set the poshold target 1m to the front, y_cm=-50 will set the poshold target 50cm to your left, z_cm=-100 will set the althold target 1m lower. This allows nav-controlled pos control without using RC or geo coordinates, all using MSP.

• MSP2_INAV_SET_GLOBAL_TARGET (8730): GCSNAV-only LLH setpoint with datum conversion; terrain rejected; updates XY always, Z only if altitude != 0; mirrors WP#255 “keep altitude” behavior.

This is the most uncertain as they mirror MSP_WP/MSP_SET_WP behavior directly for the poshold controller; i am insure about directly setting it vs using the waypoint control; but if one day there are significant changes it could be worthwhile to have dedicated MSP commands for target position, home, etc.

• MSP2_INAV_NAV_TARGET (8731): readback of desired LLH (from local+origin), local Z altitude, heading-hold target, climb demand; requires valid origin.

This is a convenient way to get directly the desired geo poshold or WP position at the same time as the target altitude, target heading and target climbrate

Fixes:

• MSP_SET_HEAD now actually sets heading target like IPF did
• gen_enum_md: regex now matches tagged enums (typedef enum name { … }) to avoid missing tagged definitions.
• Deleted the old msp_ref that was full of errors, keeping it just introduced errors

Testing

Using HITL on SBF405WM with MLRS MSP RX; using https://github.com/xznhj8129/mspapi2/tree/refactor to test MSP commands and sequences.
All the commands were verified working in their intended configuration

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