Add the xAOD TruthParticles to the TrigInDetAnalysis
The truth classes implemented in the TrigInDetAnalysis code were only those classes available in ESD and RDO since the TrigInDetValidation comparisons with truth pretty much were only ever needed to evaluate the running of the trigger itself.
As such, it was never implemented to use the xAOD::TruthParticle classes directly from xAOD.
These changes fix that, and allow the writing of the xAOD::TruthParticles from xAOD.