Add Health-regained SFX and import file

[FinalRed]

Fixes #1745

Added health regained sound effect generated with Strudel:

setcpm(96/4)

$: note("c5 e5 g5 a5 c6 ~@15").legato(4.5).room("3.0").sound("gm_xylophone" .lpf(1500))

The audio file was created by me and is contributed under the project's license :D.

[wjt]

Rather than (fixes #1745) in the title of the PR, it needs to be in the description of the PR on a line of its own:

Fixes #1745 

As i noted in the issue:

If it's already an MP3 there is no upside to converting it back to WAV - it will be lossily compressed a second time when exporting the game.

There is an annoying low frequency hum/buzz in that clip.

I think the melody is a little too long, and to me it sounds a bit too sinister for a positive effect!

[wjt]

I don't think this is a UI sound effect.

I think you could put it directly in assets/first_party/sounds, or better, in a new folder assets/first_party/sounds/collectibles/ mirroring the assets/third_party/sounds/collectibles/ folder.

[FinalRed]

Pull request updated

[wjt]

We generally try to avoid filenames with spaces in them. Please could you rename this to health_regained.wav?

[FinalRed]

I've already renamed the WAV file

[github-actions]

Play this branch at https://play.threadbare.game/branches/FinalRed/fix-health-audio/.

(This launches the game from the start, not directly at the change(s) in this pull request.)