Changes

*'''render_exterior''' - Enables rendering of the exterior scene (e.g. skybox, world and outside of the truck) to the view. Note that shadows cast to the view will still contain the exterior scene regardless of this setting.

*'''frustum_subrect_x''', '''frustum_subrect_y''', '''frustum_subrect_width''' and '''frustum_subrect_height''' - Allows to specify part of the full frustum cone which is rendered into the monitor. Can be used to move center of the projection outside of the center of the monitor. For example when using two front monitors to represent windshield of the truck while the driver is sitting before the left one, left part of the frustum can be removed to move the center of the projection before the driver. Note that change of this view will change the effective aspect ratio so both fov overrides need to be set to correct it.