add "Show Hitboxes" to the debug panel

src/frontend/debug_panel.cpp

@@ -33,6 +33,7 @@ static std::shared_ptr<Label> create_label(wstringsupplier supplier) {
     return label;
 }
 
+// TODO: move to xml
 std::shared_ptr<UINode> create_debug_panel(
     Engine* engine, 
     Level* level, 
@@ -181,6 +182,18 @@ std::shared_ptr<UINode> create_debug_panel(
         });
         panel->add(checkbox);
     }
+    {
+        auto checkbox = std::make_shared<FullCheckBox>(
+            L"Show Hitboxes", glm::vec2(400, 24)
+        );
+        checkbox->setSupplier([=]() {
+            return WorldRenderer::showEntitiesDebug;
+        });
+        checkbox->setConsumer([=](bool checked) {
+            WorldRenderer::showEntitiesDebug = checked;
+        });
+        panel->add(checkbox);
+    }
     panel->refresh();
     return panel;
 }