Custom voice pack improvements

[rrealmuto]

This PR improves and streamlines the process of creating custom voice packs for OOTR.

Currently, custom voice packs are fairly limited in terms of what you can do. They only support the vanilla sampling rate and must not exceed the original SFX length. The workflow is also a bit cumbersome and the audio files need to be manually converted to binary files to inject into the ROM using some 3rd party tools.

This PR removes all restrictions on custom voices by using the improved audio system from the MMR Music PR #2044 . Audio files must simply be mastered in .AIFF format and converted to .AIFC (the file format used by the N64) using the original N64 utility vadpcm_enc with the vanilla code book file. Will eventually write up a full procedure on creating custom voice packs in this format, but it is quite a bit easier than the current method.

Leaving this as draft until MMR music gets merged but just wanted to put it on people's radar.

Still to do:

• [ ] Merge MMR Music PR
• [ ] Clean up this PR
• [ ] Document new music workflow
• [ ] Build vadpcm_enc for windows (currently only works for linux) and maybe include the binaries in the OOTR repo?