Make audio usable

[gheskett]

• EXPAND_AUDIO_HEAP or equivalent (prevent game from dying when adding new stuff)
• Configurable max note count (emu check debatably out of scope)
• Remove hardcoded sfx table limits + make sfx IDs unsigned
• Implement fix for the™ audio crash
• Remove useless sequence volume table
• Reduce the funny spin lock (out of scope? Would increase load times substantially though)
• Fix that one audio popping issue in synthesis US/JP (maybe exists in other versions too idk)
• 0 tempo and 0 envelope support
• Any applicable (non-intrusive) optimizations
• Other misc. audio memes I can't think of right now