Change DotNet type variables for XML use to native Business Center objects

[dtovar8a]

Why do you need this change?

We need to be able to subscribe to events from codeunit 10750 "SII XML Creator", but all events use DotNet objects, so we cannot subscribe in SaaS environments.

Describe the request

To use these events in SaaS environments, you would only need to replace the DotNet objects with the native Business Central objects for manipulating XML structures.
Internal work item: AB#617032