Make the intro story skippable.

src/gui/fsm.cpp

@@ -69,7 +69,7 @@ namespace gui {
 
     if($story->playing()) {
       if(ev == game::Event::MOUSE_CLICK) {
-        $story->reset();
+        $story->stop();
       }
     } else {
       $story = nullptr;

src/gui/storyboard.cpp

@@ -47,6 +47,10 @@ namespace storyboard {
     window.draw($view_sprite);
   }
 
+  void UI::stop() {
+    $audio->stop();
+  }
+
   bool UI::playing() {
     return $audio->getStatus() == sf::SoundSource::Status::Playing;
   }

src/gui/storyboard.hpp

@@ -29,6 +29,7 @@ namespace storyboard {
     void reset();
     void track_audio();
     bool playing();
+    void stop();
     void config_camera(cinematic::Camera &camera);
   };