[ATS] Improved Train Sounds v2.3 1.29.x – 1.32.x

This mod replaces the standard trains sounds in ATS with an improved version that adds an engine, horn*, bell sound*, and rolling stock/rail noise**.
* Currently only the mover type trains have these sounds.
** Currenly only the mover type trains have this sound, it is currently not possible to apply sounds to trailing rollstock, once it is possible, they will be added accordingly.

Credits:
TruckerKid, SCS Software, DTG