AnalysisCommon fixes for building the PxAODMaker framework

As described in this AMG presentation, this MR adds back some code to EventUtils and PATCore which were removed in MR !38442 (merged) and commit 6178ac8f as well as makes a few miscellaneous fixes from experience during runtime.

The one point to still be addressed is whether IAsgSelectionWithVertexTool is necessary or not (e.g., the PV could be read from within the tool which would now inhert from IAsgSelectionTool). It can be removed, but I've done the easiest thing by migrating it to R22 and adding it back for now.

Tagging @dshope