new output_file option to avoid changing sys.stdout

[decalage2]

This pull request is meant to make it easier for other python applications to import and call pcodedmp functions directly (instead of running it as a separate process). I needed it to integrate pcodedmp with olevba. The issue is that several functions use print() a lot for display within the parsing code, so it is not possible to call pcodedmp as a library without capturing the output of all the print() calls.

Changes:

• A new parameter output_file has been added to each function that calls print(). Its default value is sys.stdout, so that normal behaviour is not changed.
• all print() calls are redirected to output_file (except when it was already directed to sys.stderr for error display)
• the main function uses output_file when the -o option is used, instead of changing sys.stdout

[bontchev]

Pull request merged.

[decalage2]

Thanks!