[FEATURE REQ] - Export Policy as XML instead of RAWXML

### Please describe the feature.

Related to #488
Re-posting this as the new version goes toward definitive release. When exporting policies, the rawxml format is not valid for other programmatic scenario (think of select-xml cmdlet in powershell).
Proposal is to add a new parameter POLICY_SPECIFICATION_FORMAT with two values: **rawxml**, default one as of today and **xml** which export policies in the escaped format.
This setting and behavior was proposed in this PR #489 , I can try to reimplement that login in the new version but do not want to waste time if this get refused again. Thanks