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This PR stems from an issue in our application about using an optional default ini file. That is sometimes present, but often not. In the current code this generated an internal exception that was caught but would clutter up trapping exceptions from other parts of the program and made debugging difficult in some cases.
This PR splits out the detection of the file and directory types into a separate function and uses that in a couple locations instead of using the Validators. This prevents any exception from being thrown for non-required config files.
Since I was working with that code anyway, I added the detection for C++17 and filesystem and the 64 bit operations on visual studio which should address #312.
use of <filesystem> can be turned off by defining CLI11_HAS_FILESYSTEM to 0