ENH: Cleanup cmake --build interface.
This cleans up the 'cmake --build' command-line interface: - Rename --clean to --clean-first to better describe it. - Replace --extra-options with a -- separator to simplify passing of multiple native build tool options. - Document the options in the main CMake man page description of the --build option, and shares this with the usage message. - Require --build to be the first argument when present. - Move implementation into cmakemain where it belongs.
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