Add REUSE 3.2 compliance

[tomodachi94]

No description provided.

[tomodachi94]

Here is a Bash script that might help you review this PR:

#!/usr/bin/env bash
# SPDX-FileCopyrightText: 2024 Tomodachi94
#
# SPDX-License-Identifier: MIT
# license_report.sh: show all files and their inline REUSE-specified licenses
# Requirements: bash, ripgrep (https://github.com/BurntSushi/ripgrep), the REUSE tool (https://github.com/fsfe/reuse-tool), and some POSIX utilities (sed, echo)
lint_output=$(reuse lint | rg -F "* Used licenses: " | sed 's/\* Used licenses\: //g')
IFS=',' read -ra LICENSES <<< "$lint_output"
echo "${LICENSES[@]}"
for license in "${LICENSES[@]}"; do
	echo "## $license"
	rg --hidden -lo "SPDX-License-Identifier\:.*$license.*" | sort | uniq
done

You'll need to install ripgrep and the REUSE tool to use the script.

This doesn't include the files listed in REUSE.toml, but that file should be fairly easy to review individually.