Outdated Petrol & Diesel V8 engines for the ETK 800/K series 4.2.1

New update here, not that much fresh new content but a lot of polish :

- New drag config for ETK 800 using a new drag block and a stage 3 turbocharger producing 1150hp
- New hillclimb config for the ETK K using the stage 1 turbocharger
- New thumbnail for all the configs to make them use PBR
- Changed the color of a few configs because PBR made some look ugly
- Added the new 0.23 content to the configs (interior options, ect...)
- Made some changes in the engine's sound of the high rpm V8
- Fixed/tweaked a lot of things in the configs
- Fixed stock turbocharger overheat bug
- Probably more things that I forgot

Have fun