Migration to cpal, symphonia

[kamiyaa]

Motivation

Currently, dizi uses rodio for audio playback. While this works great for fast development, it lacks certain features that I would like to add to dizi.
Most notably:

• Audio formats are limited
• Symphonia backend can't detect duration of audio file
• Can't seek audio
• API produces busy waiting when audio is paused
  • API is a bit hard to use in general

Migrating to cpal + symphonia should allow us to address all of these issues.
However, this will be significantly more complicated because we have to manage audio streams, packets, sampling, etc. in-house.