"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
At the application level, support the existence of subdirectories inside
the original config and data paths for a specific version of the
software. For a new installation, create them, but for an existing
installation use the most recent available version, even if it's not the
current one (and even if it's not versioned at all). Any migration must
be done at the GUI level due to the amount of data that is potentially
being copied during that process.
Use std::filesystem wherever possible, replacing most uses of
std::string when the object is actually a path. This is the first stage
of refactoring, and does not make any changes to Application that affect
client code. Access to the new directory-handling class is implemented,
but is unused by any external code.
