Adapt 'copyMultilineStringToClipboard' to windows copyToClipboard call

[runegan]

Original report by Zack Lovatt (Bitbucket: zlovatt, GitHub: zlovatt).

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    function copyMultilineStringToClipboard (text) {
        var escapedText = text.split("\n").join("&echo.").split(")").join("^^^)")
        var cmdString = 'cmd.exe /c cmd.exe /c "(echo ' + escapedText + ') | clip"';
        
        return system.callSystem(cmdString);
    }