sort PHYSLITE output objects by PT (ATLASG-2685)
For simple analysis it is nicer if the objects are just sorted by pt. This doesn't work with systematics at all, but without systematics this should (hopefully) work.
Marking this as draft, so the PHYSLITE experts can check the changes, and validate them. From my side I mostly wanted to make sure the option is there from the CP algorithms side and the whole thing runs.