Add an External Style Sheet for MHT Conversion

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Demonstrates Mht.AddExternalStyleSheet, which adds a style-sheet URL to the list of external CSS resources downloaded and embedded during conversion.

func chilkatTest() {
    let mht = CkoMht()!

    //  Add an external style-sheet URL to the list of CSS resources downloaded and embedded during
    //  conversion.  This is normally unnecessary because Chilkat automatically discovers
    //  <link rel="stylesheet"> references in the static HTML.
    mht.addExternalStyleSheet(url: "https://example-code.com/crumb/style.css")

    //  Create the MHT web archive.  The external style sheet is downloaded and embedded.
    var mhtText: String? = mht.getMHT(url: "https://example-code.com/crumb/index.html")
    if mht.lastMethodSuccess == false {
        print("\(mht.lastErrorText!)")
        return
    }

    print("\(mhtText!)")

}