Updates in download area

Trains:
New version with esternal view for openBVE of the railcar Aln663 by "fas"

Routes:
- New version for openBVE of Santhià-Biella line by Luca Revello with 4 route fils for trains Minuetto and Aln663
- Update of Biella-Oropa tramline by Luca Revello (new route file and train compatible with openBVE 1.2.12)