Imported TNFS car texture has some wrong colors

[AndyGura]

Currently, it is possible to put an image as a car texture, but on certain tracks, some colors are shown completely wrong. CFM has an additional palette !xxx, and it seems to affect displayed colors, but the pattern is unclear

Investigation steps:

• confirm that the current conversion of 24-bit dos palette colors is correct by comparing colors of images in the menu
• determine whether index of color affects conversion: fill both palettes with certain color (test with red, green, blue, and grey) and check if all pixels change their color equally
• assuming index is not affecting anything, fill !xxx palette with some color, repeat tests, and note how color changed on each map and time of a day

The steps above should narrow down the problem and give an idea of how it's done in the actual game