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).
Added Windows support for process operations.
Added unit tests for process abstraction code for POSIX and Windows.
Modified CMake config files to support building the new code and unit tests.
