Add reStructuredText (RST) documentation formatter
Temporarily add a RST formatter to convert builtin documentation to .rst source files. This will be removed shortly after we use it to convert documentation. Teach the RST formatter to: * Output preformatted blocks as reStructuredText "::" literal blocks. * Output option lists as bullet lists with option names enclosed in reStructuredText ``literal`` quoting. * Output individual documentation objects (commands, variables, etc.) in separate .rst files organized in directories by type. Replace references to cmVersion::GetCMakeVersion() in builtin documentation with the literal placeholder "|release|" that will be defined as a substitution later.
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