IV Vehicle Align

Adds a keybind that aligns the heading of Immersive Vehicles to the nearest cardinal direction during vehicle startup.
The default shortcut is T, and the effective speed threshold can be modified in the ivvehiclealign-common.toml.
在车辆起步阶段，按下T键可将沉浸式车辆的朝向对齐到最近的正方向（东、南、西、北）。
可绑定其他按键，速度阈值可在模组配置文件ivvehiclealign-common.toml中修改。