While trying to work on adding audiodump support for CLI, I was alerted that it was important to first try moving the DSP configs to the new config before continuing, as that makes it substantially easier to write clean code to add such a feature.

This commit aims to allow for Dolphin to only rely on the new config for DSP-related settings.

SPDX standardizes how source code conveys its copyright and licensing
information. See https://spdx.github.io/spdx-spec/1-rationale/ . SPDX
tags are adopted in many large projects, including things like the Linux
kernel.

Continues the migration over to fmt

Converts two panic alerts into error logs, since they aren't really
things a user can do anything about.

printf specifiers, begone!