Customizable Wheel Spacing for NFSU2 - Technical info

The mod works by creating new parts inside each car's DBModelParts collection,
xxx_KIT00-03_FENDER and xxx_KIT00-03_QUARTER,
with each LODStruct pointed to _BODY (since vanilla cars don't have seperate fender models set up).

Every spacer entry has a corresponding custom attribute added,
either FRONT_TIRE_OFFSET or REAR_TIRE_OFFSET, with the following floats:
LVL1 - 0.012; LVL2 - 0.025; LVL3 - 0.034;

In addition, quarter decal entries need to be duplicated for each KITxx introduced to prevent decal vanishing,
for each side, decal layout, and spacer.

The BINs are prepared for installation by deleting everything but the added parts,
and using Synchronize importing type, to ensure any installed custom parts won't get wiped
(stuff like moses' UG1 Kit for Eclipse)