ATS helper images for the International LT truck updates in v1.50

[pete-agreatguy]

It's in the title ...

https://blog.scssoft.com/2024/04/american-truck-simulator-150-update.html

Requires helper images for:

• bumper.paint_s13
• bumper.paint_pl_s13
• sideskirt.lng_pn_s13
• sideskirt.mid_pn_s13
• sideskirt.shr_pn_s13
• mudflaps.aero_paint
• mudflaps.aero_pnt_6x4

[pete-agreatguy]

Completed.