Clean-up Syntax of PileUpToolBase class
Cleanup PileUpToolBase and make ParticleBarcodeVeto a property of all PileUpTools. Remove the property from derived classes.
Also tidy up TestPileUpTool class.
Cleanup PileUpToolBase and make ParticleBarcodeVeto a property of all PileUpTools. Remove the property from derived classes.
Also tidy up TestPileUpTool class.