AP Class 321 Sound Fixes + Small Improvements

This improves the implementation of the sounds on the AP Class 321 and has a few other changes to make the train more consistent with newer AP packs.

Features:

• Consistent traction motor pitch curves
• AWS alarm has a lower pitch
• Cab camera is tilted slightly downwards
• High FOV cab camera and in-game driving options menu were removed
• Cab occlusion is quieter
• Secondmans headout camera replaced with bogie camera
• New flange squeal sounds
• New brake squeal sounds
• New joint sounds
• InputMappers have been changed to be more in line with newer AP packs

New InputMappers:

• DRA: Y
• Door operation toggle: Control+R
• DSD isolation: Control+D
• Master key: Shift+W
• Saloon lights on: M
• Saloon lights off: Shift+M

Tags: 321 class-321