* Adding dynamic capabilities for cart line item provisioning variables to support multiple products and removing sku download options
* Updating Microsoft.Store.PartnerCenter to 1.12.2
* Added the secure app model samples
* Incorporated changes regarding the partner service settings.
* Moved the KeyVault address to the configuration file.
* Updated the NuGet packages for the CPV sample. Also, refactored the Key Vault provider to not create new instance of the HttpClient for each time a secret is requested.