[NX-549] Refactor main supportzip api bits into java classes for simplicity.
[NX-549] Extract supportzip api
[NX-549] Add logger config for supportzip package.  Remove direct dep on nexus-atlas-plugin, no longer needed to contribute to supportzip anymore.
Merge pull request #633 from sonatype/NX-549-extract-supportzip-api

REVIEW: [NX-549] extract supportzip api