ADD: Camera mode

src/scene/camera/icamera_mode.h

@@ -0,0 +1,20 @@
+#pragma once
+
+class Camera;
+class InputSystem;
+class SceneManager;
+
+class ICameraMode
+{
+public:
+    virtual ~ICameraMode() = default;
+
+    virtual const char *name() const = 0;
+    virtual void on_activate(SceneManager &scene, Camera &camera) = 0;
+    virtual void process_input(SceneManager &scene,
+                               Camera &camera,
+                               InputSystem &input,
+                               bool ui_capture_keyboard,
+                               bool ui_capture_mouse) = 0;
+    virtual void update(SceneManager &scene, Camera &camera, float dt) = 0;
+};