ADD: Camera mode

src/scene/camera/mode_orbit.h

@@ -0,0 +1,25 @@
+#pragma once
+
+#include <scene/camera/icamera_mode.h>
+
+struct OrbitCameraSettings;
+
+class OrbitCameraMode : public ICameraMode
+{
+public:
+    explicit OrbitCameraMode(OrbitCameraSettings &settings);
+    ~OrbitCameraMode() override = default;
+
+    const char *name() const override { return "Orbit"; }
+    void on_activate(SceneManager &scene, Camera &camera) override;
+    void process_input(SceneManager &scene,
+                       Camera &camera,
+                       InputSystem &input,
+                       bool ui_capture_keyboard,
+                       bool ui_capture_mouse) override;
+    void update(SceneManager &scene, Camera &camera, float dt) override;
+
+private:
+    OrbitCameraSettings &_settings;
+    bool _rmb_down = false;
+};