Changes

Handling logic of wheels has been rewritten. Now there are not hardcoded front and rear wheel wheels anymore, but just there are simply wheels of various types.

Type of the wheel is defined by single letter. For backward compatibility so far existing wheels are F- and R-typed wheels nad wheel parts (tire, disc, hub ...). They are mounted on locator of with the same single letter tag and expected to be stored in similarly named folders with similar unit names(including wheel parts - tire, disc, hub ...). All old wheel data thus work exactly the sameas before. But in addition you can create new types defined by different letter that are used and controlled by chassis model and its locators, but shared between vehicles still. Sets of truck and trailer wheels are separated much like before.

For example, new ATS dropdecks trailers have S- and D-type wheels (single and double wheels with much smaller diameter). Wheel part accessories are stored in '''s_tire''', '''s_disc''', '''d_hub''', '''d_nuts''' and similar folders and units are named '''stire''', '''sdisc''', '''dhub''', '''dnuts''' etc.

This change affects all related data - eg. per type defined defaults in '''def/vehicle/rim_data.sii''' which require completely different fields.

== External interior locators == As we now have vastly different interiors, it is not enough that cabin toy locators for the exterior view are linked to the cabin exclusively. Thus locators can optionally be put into external interiors interior models. If they are not in the external interior model, search will fall back to the cabin (or chassis) model to preserve backward compatibility. == Accessory data ===== All accessory data ===There is new optional attribute '''part_type'''. It defines icon and tooltip shown on accessory.Available values are '''factory''', '''aftermarket''', '''licensed''' or '''unknown''' (which is also default one). === Chassis accessory data ===There is new optional attribute '''steerable_lifted_axles'''. The value is boolean with false as default. It controls whether axle reacts to steering when lifted. Mechanical solutions typicaly do, while electronic driven steering axles typicaly don't. === Interior accessory data ===There is new optional attribute '''show_chassis_rear'''. The value is boolean with false as default. It should be set true in interiors where you can see part of chassis or chassis accessory (eg ATS daycabs).It renders prebaked model of chassis and all its accessories in interior, so you might have issues with items that are mounted on chassis, but still have their own visualization in interior - you can see them twice and/or z-fighting (we had such issues with hoods and hood mirrors). To be properly visible both inside and outside, either the accessory locator should be in chassis model ONLY, or it should be in interior AND in cabin cabin model both. == Desktop trailer definitions ==Trailers shown in Trailer browser now have separated definitions from Dealer, so it behaves exactly same as truck definitions. Name of folder is ''/def/vehicle/trailer_desktop''. The reason for the change was that we want "best" or "typical" configuration for browser while we need at least one "low level" or "cheap" configuration for dealer.