No install when used as third party #231
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Added ARGPARSE_INSTALL This allows a separate project using argparse through CMake FetchContent_Declare(...) to install the project without having to also install argparse.
Default ON for ARGPARSE_INSTALL
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Currently, when using CMake and FetchContent_Declare(...) the system attempts to install argparse when "make install" is run for their project. Other libraries provide a way to avoid this by setting a variable within the CMake system. For example, GoogleTest uses the INSTALL_GTEST variable.
I attempted to do the same thing for argparse:
If the user sets "ARGPARSE_INSTALL = OFF" inside their CMake file they can use the library as you describe without having to also install it when running install on their own project.