Manifest inclusion filtering based on major version

[JoelSpeed]

Currently based on #2067

This teaches the manifest inclusion to filter based on a major-version annotation. This will allow us to concurrently build multiple major versions from a single branch while folks can include manifests (in particular feature gates) that apply only to 4, or 5, or 6 etc

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This pull-request has been approved by: JoelSpeed
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