Add support for passing cppflags through to Visual Studio project generation.

These flags can affect intellisense, for example if you are using C++17
you will have intellisense errors unless you set the appropriate CFLAGS to inform
inform intellisense of the C++ version you are using.

Additionally /Zc:__cplusplus is required for intellisense to recognise a
provided /std:c++ switch, as it is not a usual build flag we must append
it to the flags when we see /std:c++.

For more information see the page on /Zc:__cplusplus:
https://docs.microsoft.com/en-us/cpp/build/reference/zc-cplusplus

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