Function ffi_ibom_add_drawing

#[no_mangle]
extern "C" fn ffi_ibom_add_drawing(
    obj: &mut InteractiveHtmlBom,
    kind: InteractiveHtmlBomDrawingKind,
    layer: InteractiveHtmlBomDrawingLayer,
    svgpath: &QString,
    width: f32,
    filled: bool,
)

Wrapper for adding a drawing to [InteractiveHtmlBom::drawings]