ftguess: add Visio formats

[decalage2]

VSDM and VSDX have a relationship type different from other Office formats: http://schemas.microsoft.com/visio/2010/relationships/document

ftguess.py nomacro.vsdx -l debug
ftguess 0.60.1.dev8 on Python 3.9.0 - http://decalage.info/python/oletools
THIS IS WORK IN PROGRESS - Check updates regularly!
Please report any issue at https://github.com/decalage2/oletools/issues

File       : nomacro.vsdx
DEBUG    Open XML - recognize
DEBUG    Relationship: type=http://schemas.openxmlformats.org/package/2006/relationships/metadata/core-properties target=docProps/core.xml
DEBUG    Relationship: type=http://schemas.openxmlformats.org/package/2006/relationships/metadata/thumbnail target=docProps/thumbnail.emf
DEBUG    Relationship: type=http://schemas.microsoft.com/visio/2010/relationships/document target=visio/document.xml
DEBUG    Relationship: type=http://schemas.openxmlformats.org/officeDocument/2006/relationships/custom-properties target=docProps/custom.xml
DEBUG    Relationship: type=http://schemas.openxmlformats.org/officeDocument/2006/relationships/extended-properties target=docProps/app.xml
DEBUG    Main part: None
WARNING  Failed to find any known relationship in OpenXML-file
File Type  : Zip Archive
Description: Generic Zip Archive
Application: Any Zip Archiver
Container  : Zip
Content-type(s) :
PUID       : None

For VSDM it's the same URL:

ftguess.py testfile.vsdm -l debug
ftguess 0.60.1.dev8 on Python 3.9.0 - http://decalage.info/python/oletools
THIS IS WORK IN PROGRESS - Check updates regularly!
Please report any issue at https://github.com/decalage2/oletools/issues

File       : testfile.vsdm
DEBUG    Open XML - recognize
DEBUG    Relationship: type=http://schemas.openxmlformats.org/package/2006/relationships/metadata/core-properties target=docProps/core.xml
DEBUG    Relationship: type=http://schemas.openxmlformats.org/package/2006/relationships/metadata/thumbnail target=docProps/thumbnail.emf
DEBUG    Relationship: type=http://schemas.microsoft.com/visio/2010/relationships/document target=visio/document.xml
DEBUG    Relationship: type=http://schemas.openxmlformats.org/officeDocument/2006/relationships/custom-properties target=docProps/custom.xml
DEBUG    Relationship: type=http://schemas.openxmlformats.org/officeDocument/2006/relationships/extended-properties target=docProps/app.xml
DEBUG    Main part: None
WARNING  Failed to find any known relationship in OpenXML-file
File Type  : Zip Archive
Description: Generic Zip Archive
Application: Any Zip Archiver
Container  : Zip
Content-type(s) :
PUID       : None