loopy unpacking and multi packing

Current implementation of persistency configures a packer and unpacker for each location. This MR changes this to:

• one packer per object type
• each unpacker for a given location also unpacks all linked locations if they are not unpacked already. This will allow to request a location to be unpacked individually.
• Packing and unpacking configurations are simplified. PersistRecoConf is removed as most of it's functionality is not needed anymore.

Part of set !3750 (merged) DaVinci!747 (merged) MooreAnalysis!92 (merged) Analysis!918 (merged) Moore!1638 (merged)

Event/EventPacker/include/Event/Loaders.h

-/*****************************************************************************\
-* (c) Copyright 2000-2018 CERN for the benefit of the LHCb Collaboration      *
-*                                                                             *
-* This software is distributed under the terms of the GNU General Public      *
-* Licence version 3 (GPL Version 3), copied verbatim in the file "COPYING".   *
-*                                                                             *
-* In applying this licence, CERN does not waive the privileges and immunities *
-* granted to it by virtue of its status as an Intergovernmental Organization  *
-* or submit itself to any jurisdiction.                                       *
-\*****************************************************************************/
-#include "Event/PackedCaloAdc.h"
-#include "Event/PackedCaloCluster.h"
-#include "Event/PackedCaloDigit.h"
-#include "Event/PackedCaloHypo.h"
-#include "Event/PackedCluster.h"
-#include "Event/PackedData.h"
-#include "Event/PackedDataBuffer.h"
-#include "Event/PackedFlavourTag.h"
-#include "Event/PackedMuonPID.h"
-#include "Event/PackedPartToRelatedInfoRelation.h"
-#include "Event/PackedParticle.h"
-#include "Event/PackedProtoParticle.h"
-#include "Event/PackedRecVertex.h"
-#include "Event/PackedRelations.h"
-#include "Event/PackedRichPID.h"
-#include "Event/PackedTrack.h"
-#include "Event/PackedVertex.h"
-#include "Event/PackedWeightsVector.h"
-
-namespace LHCb::Hlt::PackedData {
-
-  /// create map between CLIDs and load functions
-  template <class PACKER>
-  std::pair<std::unique_ptr<DataObject>, std::unique_ptr<DataObject>>
-  loadObject( Gaudi::Algorithm const* algo, PackedDataInBuffer& buffer, std::vector<std::string>& links,
-              int bytesToRead ) {
-
-    auto pdata      = std::make_unique<typename PACKER::PackedDataVector>();
-    auto data       = std::make_unique<typename PACKER::DataVector>();
-    auto nBytesRead = buffer.load( *pdata );
-
-    if ( (int)nBytesRead != bytesToRead ) {
-      // how to pass the counter?
-      //++m_inconsistentSize;
-
-      algo->fatal() << " consumed " << nBytesRead << " bytes, "
-                    << " but " << bytesToRead << " were stored!" << endmsg;
-    }
-
-    for ( auto link : links ) pdata->linkMgr()->addLink( link, nullptr );
-    PACKER packer( algo );
-    data->setVersion( pdata->version() );
-    packer.unpack( *pdata, *data );
-    return {std::move( pdata ), std::move( data )};
-  }
-
-  template <class... PACKER>
-  auto createLoaders() {
-
-    std::map<CLID, std::pair<std::unique_ptr<DataObject>, std::unique_ptr<DataObject>> ( * )(
-                       Gaudi::Algorithm const* algo, PackedDataInBuffer& buffer, std::vector<std::string>& links,
-                       int bytesToRead )>
-        loaders;
-
-    ( loaders.emplace( PACKER::PackedDataVector::classID(), &loadObject<PACKER> ), ... );
-
-    return loaders;
-  }
-
-  const auto loaders =
-      createLoaders<LHCb::TrackPacker, LHCb::RichPIDPacker, LHCb::MuonPIDPacker, LHCb::CaloHypoPacker,
-                    LHCb::ProtoParticlePacker, LHCb::CaloClusterPacker, LHCb::ParticlePacker, LHCb::VertexPacker,
-                    LHCb::RecVertexPacker, LHCb::FlavourTagPacker, LHCb::CaloDigitPacker, LHCb::CaloAdcPacker>();
-
-} // namespace LHCb::Hlt::PackedData