Add a new spelling for module map files 'module.modulemap'

[Ben Langmuir]

    This name, while more verbose, plays more nicely with tools that use
    file extensions to determine file types. The existing spelling
    'module.map' will continue to work, and at least for now will take
    precedence if both files exist within a directory. In a future patch, I
    intend to add a warning for when both files could be found.
    
    In frameworks, this new filename will only go in a new 'Modules'
    sub-directory.
    
    Similarly, add a module.private.modulemap corresponding to
    module_private.map.

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