Remi Godin df76fd4a1b

Programmed soundtrack example (#12774) ...

Created soundtrack example, fade-in and fade-out features, added new
assets, and updated credits.

# Objective
- Fixes #12651 

## Solution
- Created a resource to hold the track list. 
- The audio assets are then loaded by the asset server and added to the
track list.
- Once the game is in a specific state, an `AudioBundle` is spawned and
plays the appropriate track.
- The audio volume starts at zero and is then incremented gradually
until it reaches full volume.
- Once the game state changes, the current track fades out, and a new
one fades in at the same time, offering a relatively seamless
transition.
- Once a track is completely faded out, it is despawned from the app.
- Game state changes are simulated through a `Timer` for simplicity.
- Track change system is only run if there is a change in the
`GameState` resource.
- All tracks are used according to their respective licenses.

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Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>

2024-03-29 20:32:30 +00:00

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