Start saving DB file again, stop DB file from growing linearly with every game exit

[AdamTadeusz]

Description

Not sure if I'm happy with this to be honest, loading the db file loads every single song that was ever played or loaded as a playlist through the mp3 player, perhaps it would make more sense to remove this db functionality altogether. I guess we can open another PR to remove this properly, but it might still be a good idea to have a commit on master where it was working.

Linked Issues

• fixes restore MP3 db saving functionality #1199

[Rainyan]

The UX could brush-up for sure, it's very confusing to navigate. Some items you have to right click but there's no context hint about it etc. And I'm not gonna pretend I understand how these playlists are supposed to be used. But it's good to get this playlist saving logic in as you said, for future iteration.

[Rainyan]

Actually, after monkeying around with the player settings, I'm seeing staged files in git:

On branch 250_mp3Database
Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
        modified:   game/neo/resource/mp3settings.txt
        modified:   game/neo/sound/playlist/soundtrack.txt

Maybe we should gitignore these, so that devs don't accidentally push their Spice Girls playlist upstream.

...or can we even sensibly ignore tracked file changes? More trouble than it's worth(?)

[AdamTadeusz]

Saving playlists should work already without this PR, I guess the db is for loading music that's expected to be played soon, but the way it works right now it will just load every single song from every playlist you've loaded so I'm not sure its the best feature, which is why I suggested removing it once we have a commit on master where it's working properly.

We want an initial settings file since it holds the current playlist without which the player will not play anything on game load, but ignoring any txt file in this folder from here on out is probably a good idea?