Function build_ground_plane_section 

pub fn build_ground_plane_section(
    ui: &mut Ui,
    mode: &mut u32,
    height: &mut f32,
    height_is_relative: &mut bool,
    shadow_blur_iters: &mut u32,
    shadow_darkness: &mut f32,
    reflection_intensity: &mut f32,
) -> bool

Builds the ground plane settings section.