Add CP::IClassificationTool + CP::AsgClassificationDecorationAlg
This is a first step in migration of IFFTruthClassifier
to Athena (see https://indico.cern.ch/event/916082/).
I propose a new CP::IClassificationTool
interface (thanks @jburr for the idea) to get the classification as int
. A companion CP algorithm is also added to decorate this on a particle.
Note that this is not fully functional yet as there is no tool that uses this interface, but I wanted to keep the amount of changes small. I supposed this might start some discussion, so I start with an interface proposal.