"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
* fix crash because of incomplete inheritance of BlendPoint and BlendCurve -> do not inherit from BaseClass
as consequebce make destructor non-virtual and remove getPyObject
* pass std::vector by const reference
* remove unneeded includes
* use more suitable Python exception types
* when returning with null from Python handler then set an exception
* harmonize file guards
* several optimizations or simplifications
* use modern C++
* harmonize command name
* fix copyright note
