[nostalgia/core] Rename customData functions in Context and move them out of Context

src/nostalgia/core/glfw/core.cpp

@@ -45,7 +45,7 @@ ox::Error run(Context *ctx) noexcept {
 		glfwSwapBuffers(id->window);
 	}
 	// destroy GLFW window
-	oxReturnError(renderer::shutdown(ctx, ctx->rendererData<void>()));
+	renderer::shutdown(ctx, ctx->rendererData<void>());
 	glfwDestroyWindow(id->window);
 	ctx->setWindowerData(nullptr);
 	delete id;