Roundback, Shocker, Wbody & More Update

Hi all, hope everybody has been enjoying the Impala. I've taken the last few weeks as an opportunity to improve and add onto the existing vehicles. In particular, I wanted to improve the roundback most, making it more realistic and more competitively viable without being so frustrating to run against. The vehicle has been adjusted front to back.

I've also spent a lot of time reworking the structure of the shocker subframes. The stock subframe should be much better for stock rules now. The limited subframe has also been adjusted, however it may need more work. I will be monitoring these cars and adjusting them accordingly. The lumina has seen adjustments to it's frame as well as new headers and hoods.

- Added new window bars & chain (removed old window bars on vics)
- Added roof prebending options to vic wagons
- Added loaded rear roundback bumper
- Added 73 rear wagon bumper to roundback
- Added Elliott i4 & v6 headers to Lumina
- Added hood variants to Lumina

- Adjusted impala rear frame rails & trunk  deformation to go up slightly more reliably
- Adjusted shocker subframes, with an emphasis on stock viability
- Adjusted shocker front suspension, maximum ride height, and wheel offset
- Adjusted shocker fenders, core support, hood, roof
- Adjusted roundback roof, floors, rear body mounts, rear frame rails, quarter panels
- Adjusted olds fenders
- Adjusted GM suspension
- Adjusted olds stock frame strength at firewall
- Adjusted i4 power curves
- Adjusted wbody frames, subframe deformation & strength

- Fixed regular creased vic wagon not appearing in menu
- Fixed instability in shocker during fairgrounds scenerio
- Updated all vehicle textures to new texture system (I will post coding examples in the RDP discord soon)

Download Link (Do Not Redistribute) - https://drive.google.com/file/d/1gayWhRWL2xbwVEDhgDGVOgEGGvwJDQam/view?usp=sharing