feat(scene): add credits scene and UI

include/Cubed/scene/credits_scene.hpp

@@ -0,0 +1,20 @@
+#pragma once
+
+#include "Cubed/scene/scene.hpp"
+#include "Cubed/ui/credits_ui.hpp"
+namespace Cubed {
+class SceneManager;
+class CreditsScene : public Scene {
+public:
+    CreditsScene(SceneManager& scene_manager);
+    void update(float dt) override;
+    void render(Renderer& renderer) override;
+    bool handle_event(const Event& e) override;
+    void on_enter() override;
+    SceneManager& scene_manager();
+
+private:
+    SceneManager& m_scene_manager;
+    CreditsUI m_ui;
+};
+} // namespace Cubed

include/Cubed/scene/scene.hpp

@@ -3,7 +3,7 @@
 namespace Cubed {
 class Renderer;
 
-enum class SceneType { MAIN_MENU, WORLD };
+enum class SceneType { MAIN_MENU, WORLD, CREDITS };
 
 class Scene {
 public:

include/Cubed/ui/column_layout.hpp

@@ -15,7 +15,7 @@ public:
     float width() const override;
     float height() const override;
 
-    void set_spacing(int spacing);
+    ColumnLayout& set_spacing(int spacing);
     // No need for parent node pointer; do not modify children's anchors and
     // scale.
 

include/Cubed/ui/credits_ui.hpp

@@ -0,0 +1,16 @@
+#pragma once
+
+#include "Cubed/ui/ui_manager.hpp"
+namespace Cubed {
+
+class CreditsScene;
+
+class CreditsUI : public UIManager {
+public:
+    CreditsUI(CreditsScene& m_scene);
+    void init() override;
+
+private:
+    CreditsScene& m_scene;
+};
+} // namespace Cubed