NFSUC - Renault Mégane Fixes

Just a buncha fixes for the Mégane, which has some issues in this game.

• Better Sounds - Vanilla game uses Evo 8 & 9 sounds, same as a few other cars in the game. I changed the stock sounds to ren_clio_a (stock AE86 from PS), & upgraded sound to vw_gti_a (maxed out Golf from MW).

• Fixed TurboSND - This car is turbocharged IRL, but the stock version has no TurboSND. This fixes that (same SFX as the stock Scirocco).

• Fixed Two-Tone Vinyl Thumbnails - In the vanilla game, the Two Tone 1 vinyl shows the image for Two Tone 2, and vice versa. So I swapped them back using TexEd.

• (Optional) Tier 3 to Tier 4 - This car is quite slow in comparison to other Tier 3 vehicles, & the performance bars for this car are identical to the Scirocco. This leads me to believe this car was placed in the wrong class, but I can't know for sure. I've included an extra script which changes the car to Tier 4, along with unlocking it from the beginning of the game. (there's another script to revert back too).

That's all. Hope you have a good day :)