Expose "Landed Cost Vendor" flag in API (GET Vendors/Vendor)

[Gabriel Acosta]

As an EFH that exports invoices to Visma.NET through the API we need read this flag so we can use it when we export invoices to Visma.NET ERP 

Function: Use the flag to create correct lines when exporting invoice to Visma.NET ERP 

Benefit: Better integration between Winvoice and Visma.NET ERP to make customers happy!

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[Gabriel Acosta]

Connected to this idea: Landed Cost Functionality