Save ID/OD boundary traj points in WCSimRootTrack

[kmtsui]

Check pre-step and post-step volume names and save trajectory points whenever crossing ID blacksheet or OD tyvek.
These trajectory points are saved within WCSimRootTrack class and can be accessed with functions GetBoundaryPoints, etc.

For example, for a muon travelling downward from ID to OD, these trajectory points are saved

Pos -2746.17 -4000 -1176.95  KE 1899.06 Type 1 // ID-blacksheet boundary
Pos -2746.02 -4020 -1176.87  KE 1895.82 Type 1 // blacksheet-deadspace boundary
Pos -2744.79 -4199.5 -1176.08  KE 1855.74 Type 2 // deadspace-inner tyvek boundary
Pos -2744.79 -4200.5 -1176.07  KE 1855.67 Type 2 // inner tyvek-OD boundary
Pos -2744.16 -5221.5 -1179.85  KE 1552.17 Type 3 // OD-outer tyvek boundary
Pos -2744.15 -5222.5 -1179.86  KE 1552.12 Type 3 // outer tyvek-outside world boundary