16baac9353
- Applies to [orientation specifiers](https://mujoco.readthedocs.io/en/latest/modeling.html#frame-orientations) in `body`, `inertial`, `geom`, `site`, `camera`. - Before this change the check was done only for multiple *alternative* specifiers, but not for `quat` and an alternative specifier. - Moved the check from the compiler to the parser. - Added tests. PiperOrigin-RevId: 453201981 Change-Id: I20907361f211dae904e734cd083e9df0efe4f654