The extra leading `"CLI/"` part of include directives prevents the
inclusion of `CLI.hpp` from a relative directory without an extra `-I`
or `/I` compiler directive, and makes it harder to make CLI11 part of a
larger codebase.
This is a regression of #475.
Update and test with some newer compilers and cmake versions
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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
* fix: show newline before footer only if footer is set and not empty
* feat: added usage message replacement feature
* fix: tests corrected for new help message formatting