fixed missing front sand filler cap, misisng hood brush on GP38/39/40 models

revamped EMD GP38, GP39, GP40

lots of minor fixes to textures, added a boardsless and headlights less rear lighting group for the c307 lineup, fixed a couple model leaks and just a pile of tiny stuff otherwise ive been adding up -laz

fixed all weather window, added a leverless version of the XM-781 for holo use -laz

overhauled EMD desktop stand for ICE-equipped SD70s and up

added EMD SD80MAC, SD9043MAC, phase 1 SD90MAC-H

added new single air hose model, fixed blower duct clearance on fb-3; renamed fb3 bearing bodygroups to better reflect what they are -laz

fixed all weather window and made it stick out SLIGHTLY more. like literally one inch. -laz

added ACF 1958 cubic foot two-bay covered hopper -laz

minor filepath patch