optimized fan out calculation of masks for GPIO initialization.
Added some basics to mask pads during GPIO initialization (wip)
Doxygen file documentation and modules.
Updated Chibi-OS to version 18.2 and adapted AMiRo-OS accordingly: - Switched to new time conversion macros - Use PAL for interrupts instead of the EXT Driver - Use new kernel tests
moved the /os/modles directory to /modules