Add 2FA support for "Store Vendor" user type for Woo/WCFM based B2B sites#69

Started out trying your 2FA Email Authentication, but quickly found out that Store Vendor user type is not supported. I have a woocommerce/WCFM based B2B website, so the majority of users are Store Vendors.

It would be good to add Store Vendor as a validy user type. This addition should help gain more users for your product.

Update, user request (ticket #14273)

Shield is lacking for Woocommerce. Sure you must have had other feedback in this regard, but this is specifically related to 2FA for Woocommerce. Maybe something for an improvement list along the line.

Bigger sites often have custom roles like VIP & Wholesaler that are not on the list of user roles to select for 2FA by email. We have used your functions snippet (https://gist.github.com/paulgoodchild/c39c1ee72bfdcdbd705362cdcc140757) to achieve what we needed, but it should actually be selectable from the dashboard.

The 2FA email that goes out is really not on standard for a Woocommerce store. We played with the template, but eventually just opted for a different plugin to handle this. However, we would prefer to use Shield. All the functionality is already there. Use the sites theme and allow the user to populate the wording. PS. We still regularly get people asking a URL instead of a code as its just not fun to struggle with this on a mobile phone several times a day in some cases.

Woocommerce customers dont see the Wordpress dashboard and therefore cannot setup Google Authenticate by themselves.