Add bash script to convert builtin help to reStructuredText
Create a convert-help.bash script to extract builtin documentation as reStructuredText sources in a new Help directory. Run each executable with the --help-full option targeting a .rst file to extract the documentation. Generate Sphinx "toctree" directives to point each man page at the corresponding documents it should contain. Organize cmake-commands(7), cmake-properties(7), and cmake-variables(7) man pages into sections similar to those generated by --help-properties and --help-variables output previously.
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