Make MuonStandaloneRec work with hits and clusters

Template MuonStandaloneRec work with MuonCommonHit and MuonCluster, to be use for tag-and-probe tracking efficiency measurements. Also:

• Improve MuonStandaloneTrack
• Add the possibility of constraining y at z=0 in the fit of the track in the muon system.
• Introduce a converter from MuonHitContainer to std::vector<MuonCommonHit> to make MuonStandaloneRec compatible with hits and clusters.
• Add lower-case accessors in MuonCluster, to make it compatible with MuonCommonHit