fix class and function inclusion

was in_src[1] which obviously backfired for ut_core.cpp which has not
been checked in.

dump_harness and syntax_check passes unchanged.
utests first cut

With this CL the first take to plex unittests is complete

gen\ut_core.cpp replaces ut_core.cpp which is the input to plex.exe via
the gen_utests.bat script.

So far only CpuId is being tested.
remove plex_log.txt

Does not seem worthy of tracking.
update gitignore

to ignore the logs