WiLabV2Xsim updates for related paper

This version is updated for a related paper:

V. Todisco, S. Bartoletti, C. Campolo, A. Molinaro, A. O. Berthet and A. Bazzi, "Performance Analysis of Sidelink 5G-V2X Mode 2 Through an Open-Source Simulator," in IEEE Access, vol. 9, pp. 145648-145661, 2021, doi: 10.1109/ACCESS.2021.3121151.