Allow access to unsanitized file name #800
                
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Hello there! I've come across a situation where I have to save a file with a "double" extension (
*.kepub.epub), and the current implementation of (r *Response) FileName() purposefully breaks that by always callingSanitizeFileName().I propose to provide direct access to an unsanitized file name with the method
RawFileName(). This shouldn't affect compatibility and allows for accessing information similar to URL package'sRawPath,RawQuery, etc.