Use common definitions for WaferTree, in place of PixelGeoModelXml/ModuleTree and StripGeoModelXml/WaferTree which implemented classes with the same names, causing clashes in destructors when running both simultaneously.
WaferTree
PixelGeoModelXml/ModuleTree
StripGeoModelXml/WaferTree
CC @dzengerj @iwang @mamirono @nstyles @tlari @goblirsc @hhayward