[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.
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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.