Add additional site attributes

[lnorlial]

Hi,
I would like to contribute by adding some additional attributes for site.
We use encryption in 2019.4, unable to find in the existing code for this attribute. How can I contribute to add the following site attributes:

    extract_encryption_mode = site_xml.get('extractEncryptionMode', '')
    metrics_content_type_enabled = string_to_bool(site_xml.get('metricsContentTypeEnabled', ''))
    sheet_image_enabled = string_to_bool(site_xml.get('sheetImageEnabled', ''))
    mobile_biometrics_enabled = string_to_bool(site_xml.get('mobileBiometricsEnabled', ''))

We use the attributes to modify the setting from default value.

Thanks,

Lian

[jacalata]

These have been added.