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Add egammaCalo only extension method. Extrapolate to specific surfaces given by the cluster

Christos Anastopoulos requested to merge ATLAS-EGamma/athena:naive_skeleton_for_egamma_calo_only into master

Add egammaCalo only extension method. Extrapolate to specific surfaces given by the cluster and find where the track crossed them.

Tag @schaffer , @jdevivi @turra

As an example of possible usage one could change (this actually I confirmed it works but did not change here ) for the rescaled perigee egamma extrapolations in EMExtrapolationTools.cxx

-      std::unique_ptr<Trk::CaloExtension> extension =
-        m_perigeeParticleCaloExtensionTool->caloExtension(
-          ctx, trkPar, direction, Trk::muon);
-      didExtension = extension != nullptr;
-      if (didExtension) {
-        intersections = getIntersections(*extension, cluster);

+      const auto extension =
+        m_perigeeParticleCaloExtensionTool->egammaCaloExtension(
+          ctx, trkPar, cluster,direction);
+      didExtension = !extension.empty();
+      for (const auto& i : extension) {
+        intersections.emplace_back(
+          i.first, i.second->position().eta(), i.second->position().phi());

for now I added the way to do it / method but not something like the above

Edited by Christos Anastopoulos

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