Master muonsegmentfinding privatetools gradual

This migrates some muon segment tools to be private.

I also tried to clean up some confusion with the configuration, specifically with MuonSimpleAmbiguityProcessorTool

Some tools must remain private for the moment, such as the TOF Tool in MdtDriftCircleOnTrackCreator, because it turns out that MuGirl is calling setBeta etc on the tool, in execute(). This needs fixing obviously, but is out of the scope of this MR.

I've tested with q431 & q221 and full recompilations of Athena locally, and so this time the result really should be the same!