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helptext: add support for custom banner message

Thomas Flori requested to merge github/fork/mfn/mf-banner into master

Created by: mfn

This adds the methods setBanner() and getBanner() to allow customization of the banner message itself.

Example scenario: I write an application which accepts an arbitrary number of files ("operands" in your terms) but it's hard to properly convey to this user. The would allow me to change the message e.g. to: Usage: myscript [options] [operands] to Usage: myscript [options] <files...> etc.

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