Function start_async_wget_with_retry

src/async_handler.cpp:115–126

	}

	void start_async_wget_with_retry(async_download_context* ctx) {
		emscripten_async_wget2(
			ctx->url.data(),
			ctx->file.data(),
			"GET",
			ctx->param.data(),
			ctx,
			download_success_retry,
			download_failure_retry,
			nullptr
		);
	}

	void async_wget_with_retry(
		std::string url,