updated all file headers to 2019
Minor optimizations regarding memory utilization.
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