[WIP] Expose headers in `GaudiCommonSvc`
As discussed with @clemenci, I made a few structural changes to GaudiCommonSvc
so that we can use the headers in a specialised histogram service for HLT monitoring in LHCb.
As discussed with @clemenci, I made a few structural changes to GaudiCommonSvc
so that we can use the headers in a specialised histogram service for HLT monitoring in LHCb.