"Professional CMake" book suggest the following:
"Targets should build successfully with or without compiler support for precompiled headers. It
should be considered an optimization, not a requirement. In particular, do not explicitly include a
precompile header (e.g. stdafx.h) in the source code, let CMake force-include an automatically
generated precompile header on the compiler command line instead. This is more portable across
the major compilers and is likely to be easier to maintain. It will also avoid warnings being
generated from certain code checking tools like iwyu (include what you use)."
Therefore, removed the "#include <PreCompiled.h>" from sources, also
there is no need for the "#ifdef _PreComp_" anymore
The benifit of StringHasher optimization for IndexedName is most evident
on boolean operation of primitive/dumb shape array, e.g. those imported
from STEP, because those shape elements are not encoded, henced mapped
in as plain IndexedName. The optimization split the integer from the
IndexedName to only store the type name to reduce redundancy.
