WIP: muon segment finding private tools migration
Still trying to get the MR originally done by @dabbott in.
I found some more configuration issues - it seems like the MuonAmbiProcessor was two different instances of two different types of tool, and the configuration in MuGirlStau was by fluke rather than design.
Not completely sure I have everything fixed yet, but I would like to run some CI here, hence the WIP.