REVIEW [NX-539] Unpack various P2 resources by-reference

Avoiding any explicit/implicit knowledge of the plugin-repository.

Uses https://github.com/zeroturnaround/zt-zip instead of Plexus UnArchiver

https://issues.sonatype.org/browse/NX-539
http://bamboo.s/browse/NX-OSSF124-2 :white_check_mark: