Complete `types/model_editing.rs` !

[kanarus]

rusty_mujoco/src/types/model_editing.rs

Lines 138 to 150 in a29d867

	/*
	typedef struct mjsBody_ { // body specification
	mjsElement* element; // element type
	mjString* name; // name
	mjString* childclass; // childclass name
	// body frame
	double pos[3]; // frame position
	double quat[4]; // frame orientation
	mjsOrientation alt; // frame alternative orientation
	// inertial frame