Adjusting playlist volume adjusts track volume actually

[oblanc-gpsw]

Description of the problem

When setting the playlist volume through the API: For example when requesting viewer.playlists.playlist.volume = 1 only the volume of the audio track currently played is executed.
Note: It is weird but cool in a way because there is no track volume supported in the JSON reference.

ForgeJS version

0.9.5

Browser

• All of them
• Chrome
• Firefox
• Internet Explorer

OS

• All of them
• Windows
• macOS
• Linux
• Android
• iOS

How to reproduce the problem

1. Add a playlist with several tracks

"playlists": {
    "volume": {
        "default": 0.1,
        "max": 1.0
    },

    "lists": [
        {
            "uid": "playlist-1",
            "name": "Playlist #1",
            "default": "audiotrack-1",
            "tracks": ["audiotrack-1","audiotrack-2"],
            "autoPlay": false,
            "volume": {
                "default": 0.3,
                "max": 1
            }
        }
    ],

    "tracks": [
        {
            "uid": "audiotrack-1",
            "author": "Olive",
            "name": "Cat",
            "url": "assets/sounds/cat.mp3"
        },
        {
            "uid": "audiotrack-2",
            "author": "Olive",
            "name": "Bird",
            "url": "assets/sounds/bird.mp3"
        }
    ]
}

2. When the playlist is active, request for example viewer.playlists.playlist.volume = 1
3. The audio volume request is only applied to the audio track that is currently playing