change LHCb::State to StateVector in extrapolation
- change LHCb::State to StateVector in extrapolation to avoid use of geometry
- add counters in
MuonUTSeeding.cpp
to record number
partially address #332
Should go together with Moore!1567 (merged) !2951 (merged) LHCb!3622 (merged)
cc @decianm
Edited by Peilian Li