Changes

COG data was moved from trailer definition to chassis data. They are easier to edit, they have less count than trailer definitions and on given chassis cargo is typically loaded in same way.

Value logic itself work as before: '''cog_cargo_mass_min''' (float, default 0) and '''cog_cargo_mass_max''' (float, default 20000) sets border limits and '''cog_cargo_offset_min''' (float3, default (0,0,0)) and '''cog_cargo_offset_max''' (float3, default (0,0,0)) set values for interpolation.