Resolve ATLTAU-1756 and ATLTAU-1758
Closes ATLTAU-1756, ATLTAU-1758
Migration of TauAnalysisTools efficiency correction (ATLTAU-1756) tools and ditau tools (ATLTAU-1758) from R21.2. This MR copies over the R21.2 recommendations into master and cleans up outdated recommendations. Both set of tools were migrated in same MR due to their mutual dependence.
Code clean up and documentation has started in this MR and will continue as testing of R22 is underway.