ScanMsi

[phutelmyer]

Describe the change
This PR attempts to collect metadata for MSI files using Exiftool. The metadata includes information such as the name, author, create date, and other metadata contained in various MSI samples.

Note: This scanner is slightly redundant if also using the general Exiftool, this will allow users to store and search based on known keys in MSI files. Use this scanner if you do not wish to have ScanExiftool running in your instance.

Describe testing procedures
Tested against several MSI samples collected from VirusTotal. PyTest was generated and tested and is available in this PR.

Sample output

...
    "msi": {
      "Author": "Sun Technology Network",
      "CodePage": "Windows Latin 1 (Western European)",
      "Comments": "This installer database contains the logic and data required to install Oracle Java SE.",
      "CreateDate": "\"1260532064\"",
      "FileType": "FPX",
      "FileTypeExtension": "fpx",
      "Keywords": "Installer",
      "MIMEType": "image/vnd.fpx",
      "Pages": 200,
      "RevisionNumber": "{43BA06D9-9F1E-45FA-9015-AE0BACE44B5A}",
      "Security": "Read-only recommended",
      "Software": "Windows Installer XML Toolset (3.11.2.4516)",
      "Subject": "Oracle Java SE",
      "Template": ";1033",
      "Title": "Installation Database",
      "elapsed": 0.183507
    },
...

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of and tested my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings