Support completely custom AppxManifest.xml

[iongion]

PR tries to give total control over the manifest to the users.

To provide mitigation for issues like

• Custom AppXManifest.xml template #3072
• Invalid Identity.Publisher in AppxManifest.xml #3501
• Question: AppxManifest.xml - MaxVersionTested attribute - windows firewall rules - desktop2 namespace #6745

[changeset-bot]

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Latest commit: b99a430

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