Fix crashes caused by malformed vehicle model replacements

[HeresHavi]

Summary

Added checks for required model frames before applying custom vehicle replacements.

Bike and BMX replacements now require both wheel frames, while Vortex replacements require the left landing gear frame. Missing plane panel frames are also disabled safely.

Rejected replacements keep the previous working model active and are no longer retried whenever the model streams in.

Motivation

GTA expects certain vehicle types to contain specific model frames. A replacement DFF can load successfully while still missing the frames needed by the vehicle it replaces, causing a crash later when GTA creates or renders it.

For example, a server might use a modified Super GT model as a replacement for a bike or Vortex. When the vehicle streams in, or when a player fires a weapon nearby, GTA can try to use wheel or landing gear frames that do not exist and crash the player's client.

Crash Stacks

Exception: Access violation

CBike::SetupSuspensionLines
Offset: 0x002B8AC9

Exception: Access violation

CMatrix::Attach
Offset: 0x0019BD39

Test plan

Runtime

• Before Fix: Reproduced both reported access violations with malformed vehicle replacements.
• Train and Plane Cases: Tested all 6 train models and all 11 plane models using the modified Super GT replacement.
• Bike Cases: Tested the modified Super GT replacement with all 13 bike models.
• Vortex Case: Tested the modified Super GT replacement on Vortex while firing weapons nearby.
• Plane Panel Case: Applied 22 repeated damage events to a malformed Rustler replacement without crashing.
• Replacement State: Confirmed rejected replacements kept the previous working model active and restored it correctly.

Builds and Tests

• Debug | Win32: Full build passed, 304 client tests passed.
• Release | Win32: Full build passed, 304 client tests passed.

Checklist

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