Advtrains Sounds Api — Luanti Mod by Andrey01

# Advtrains Sounds API 1.0 Adds various event sounds of wagons (arrival, departure, driving and etc) for advtrains and API for their registration. It provides the new table field for `advtrains.register_wagon` in the following form: ``` sounds={ -- listing ogg files door_open=<soundname>, -- plays on doors opening door_close=<soundname>, -- plays on doors closing depart=<soundname>, -- plays when train speed is increasing (departure) arrive=<soundname>, -- plays when train speed is decreasing (arrival) loop<soundname>, -- plays when train is going at constant speed loop_inside=<soundname>, -- plays when train is going at constant speed and player is inside it loop_outside=<soundname> -- plays when train is going at constant speed and locating from player at the distance of 20 blocks }```