build 200322. coupler adapter, automatic coupling vehicle setting, parked vehicle manual brake activation, ai braking logic enhancement, opengl 3.3 renderer diffuse color visualization fix, minor cab control logic bug fixes

Model3d.cpp

@@ -448,9 +448,13 @@ int TSubModel::Load( cParser &parser, TModel3d *Model, /*int Pos,*/ bool dynamic
         */
         {
             // if material has opacity set, replace submodel opacity with it
+            // NOTE: reverted to use base opacity, this allows to define opacity threshold in material
+            // without it causing the translucent models to become opaque
             auto const opacity { (
+/*
                 false == std::isnan( mat.opacity ) ?
                     mat.opacity :
+*/
                     Opacity ) };
             iFlags &= ~0x30;
             iFlags |= (