This module searches for doxygen installations on system.
find and find_first are the most generic functions.
find returns a list of installed doxygen matching the
given options, and find_first returns only the first result.
If you are only interested in the latest version of doxygen, use
get_latest. To get just the installation path, use get_latest_path. To get
just the version number, use get_latest_version.
If you want to use your own version of doxygen.exe instead of the one installed
on your system, use set_doxygen_path to provide its location.
If you want to use a mirror instead of offical doxygen webserver to download
portable doxygen, for example when on an intranet that does not have access
to Internet, use set_download_mirror and provide the URL of the mirror.