This pull request includes several updates to the game's scene management and event handling, as well as some refactoring to improve code maintainability. The most important changes include adding a new pause event, updating high score retrieval and storage, and refactoring interactive elements in various scenes.

Event Handling Improvements:

• Added a new PAUSE_REQUESTED event to CrossSceneEvent in src/constants/events.js to handle pause requests across scenes.
• Updated Battle scene to handle PAUSE_REQUESTED event and launch the pause menu with an additional parameter. [1] [2] [3]
• Modified HUD scene to emit PAUSE_REQUESTED event instead of directly launching the pause menu.

High Score Management:

• Updated high score retrieval and storage to use this.registry instead of this.game.registry in Battle, HUD, and Preloader scenes for consistency. [1] [2] [3] [4]

Interactive Elements Refactoring:

• Refactored Controls and Credits scenes to store interactive items and properly clean up event listeners on shutdown. [1] [2] [3] [4]
• Added onBackButtonPressForInstance and onButtonPressForInstance functions to handle button presses in a more modular way. [1] [2]

Menu System Enhancements:

• Updated MainMenu and PauseMenu scenes to dynamically update sound toggle labels based on the current sound state and handle data changes for sound preferences. [1] [2] [3] [4]

Code Cleanup:

• Removed unused WEBSITE_URL import from Controls, Credits, and MainMenu scenes. [1] [2] [3]
• Removed unused _tweenTimeline property from GameOver scene.

Fixes #60