add standard 'hud.*' elements ids

src/frontend/debug_panel.cpp

@@ -37,6 +37,7 @@ std::shared_ptr<UINode> create_debug_panel(
     Player* player
 ) {
     auto panel = std::make_shared<Panel>(glm::vec2(250, 200), glm::vec4(5.0f), 2.0f);
+    panel->setId("hud.debug-panel");
     panel->setPos(glm::vec2(10, 10));
 
     static int fps = 0;