* Add PIO.h header verification to CI Ensure all PIO .pio.h headers match the .pio sources in the tree * Install all tools for Style check * Clean up mismatched PIO headers No functional changes, but the PDM pdm.pio file did not init a data pin while the pdm.pio.h (the one actually used in the core) did. Correct to match. * No need for submodules in the style check