Add support for XM files

[lunaroidgmd]

Can we have XM file support pls?

[lunaroidgmd]

Also .it and .s3m files.

[Fleeym]

Not sure if fmod (or GD) supports playing those filetypes. If they play fine then I can add support for them.

[Fleeym]

Did a little digging, as of 2.02 FMOD supports the following filetypes, so GD might be able to play them: https://www.fmod.com/docs/2.02/api/core-api-sound.html#fmod_sound_type.

If you can send some sample files here for testing it would be appreciated.

[lunaroidgmd]

https://files.catbox.moe/6v9o3b.xm

[lunaroidgmd]

jumper XM recreation

[Fleeym]

Will be fixed by #136. I'll close the issue when a new version is out.