Peterbilt 377 v1.0

As an AMT team member, I’ve updated the truck with a few more parts and some ao_bake. Please enjoy.
- fixed broken mirrors
- added two more grill options
- 2 bumper options
- 8 exhaust options
- 4 tank options
- gps option
- added daycab option
- all cabs ao baked
- chrome textures adjusted
- added/adjusted shadows