Use .wav files with SMPL chunk instead of .aif

[ipatix]

I discussed this with ShantyTown on the Discord:

Basically moving the sound data from .aif to .wav format might make it easier to deal with them. Wavosaur and Polyphone soundfont editor can read and write the SMPL chunk. These might not be the ideal tools to edit sound data, but at least they can edit them at all.

For conversion I wrote a tool called wav2agb [1], it kinda works similar to aif2pcm, but would probably need a rewrite (the code is not terribly compelx). It also won't produce reproducable builds (which would be kinda essential for the decomps).

https://github.com/ipatix/wav2agb