Along with the platform defines and platform string defines provided by
CMake to the build, add a PLATFORM_MASK define.
Use this define as a platform-type mask with the PlatformType enum.
This change causes Doxygen to error if there are unrecognized commands, or
undocumented/incorrect parameters in documented functions. It does not require
that every function be fully documented, just that those that are do not have
errors.
Old documentation with problems was fixed to comply.
This includes a minor SDK refactor as it move quite a few specialized
functions and facilities from core.h into system.h. There was a breaking point
for needing to frequently update core includes.
The new logger systemLog function allows a call site to bypass logging config
and write a line to the OS logger (aka syslog).
