move GNPSExport to lib

[timosachsenberg]

Description

Moves GNPSExport functionality to library. Some smaller fixes.

Checklist:

• Make sure that you are listed in the AUTHORS file
• Add relevant changes and new features to the CHANGELOG file
• I have commented my code, particularly in hard-to-understand areas
• New and existing unit tests pass locally with my changes
• Updated or added python bindings for changed or new classes. (Tick if no updates were necessary.)

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[timosachsenberg]

rebuild jenkins

[timosachsenberg]

rebuild jenkins

[hroest]

can you add a unit test for this class?

[jpfeuffer]

Error compiling Cython file:
------------------------------------------------------------
...
        #  DefaultParamHandler        

        GNPSMGFFile() nogil except +
        GNPSMGFFile(GNPSMGFFile &) nogil except +

        void run(String & consensus_file_path, StringList & mzml_file_paths, String & out) nogil except + # wrap-doc:Export consensus file from default workflow to GNPS MGF format
                                              ^
------------------------------------------------------------

[timosachsenberg]

rebuild jenkins

[timosachsenberg]

tests passed