[nostalgia/core] Remove renderer funcions from Context friends

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));
+	oxReturnError(renderer::shutdown(ctx, ctx->rendererData<void>()));
 	glfwDestroyWindow(id->window);
 	ctx->setWindowerData(nullptr);
 	delete id;

src/nostalgia/core/glfw/gfx.cpp

@@ -66,7 +66,10 @@ ox::Error initGfx(Context *ctx) noexcept {
 		//io.MouseDrawCursor = true;
 		ImGui_ImplGlfw_InitForOpenGL(id->window, true);
 	}
-	return renderer::init(ctx);
+	void *rendererData = nullptr;
+	oxReturnError(renderer::init(ctx, &rendererData));
+	ctx->setRendererData(rendererData);
+	return OxError(0);
 }
 
 void setWindowTitle(Context *ctx, const char *title) noexcept {