[slachiewicz]

Adds requireExplicitDependencies to copy and unpack. When set, the goal fails before resolving anything if an artifactItem or <artifact> is not declared as a dependency of the project, so Maven orders the reactor correctly. An item matches a declared dependency on groupId, artifactId, extension and classifier, or a pom-typed declaration of the same groupId and artifactId; an explicit or resolved version must equal the declared one or fall inside its range. The check does not apply when the goal is invoked from the command line.

Fixes #1542

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