Adjustable turbocharger for Barstow 2.0

Adds a sport exhaust with a different sound using the new update features. Also updated the turbo files for the new update.

Can't remember all that I did. But reworked the turbo's efficiency a bit and played with a few other things. Also renamed the main file so I could find it easier in the mods folder. Ran a best of 7.4xx.

I renamed the turbo that was in this mod to Stage 1 and added a bigger turbo and named it stage 3.

Increased the efficiency so it takes less boost to make power, similar to a real V8 boosted car because they generally run larger turbos than the 4 cylinders which is what I took the turbo from.

updated for 0.12

Made the turbochargers work for the new update. Haven't got around to the exhaust and the turbo drag preset needs work.

Changed a few values to help prevent the turbo from overheating.

Added a sport exhaust and race exhaust. Both have different loudness of afterfire and different abouts of flames. Thanks to Ai'Torror for explaining how to do this. Both share the same model which also share the same model from the stock exhaust. Hopefully I will fix this in the future when I learn modeling with Blender.

Added adjustable stage 1 turbochargers for lower boost and more street friendly power levels.

Made a drag configuration with the 423