Updated flatten_selected_channels to preserve shared layers, readme.txt, updater and tools_update. Removed export_images_flattened and wip_export_token_images_flattened as they are no longer needed
Updated flatten_selected_channels to preserve shared layers, readme.txt, updater and tools_update. Removed export_images_flattened and wip_export_token_images_flattened as they are no longer needed