Use curl if wget is not available

[sparr]

Fall back on curl if wget is not available to download music files.

curl -z FILENAME -O is effectively similar to wget -N except that it prints three warnings if the file doesn't exist. I can't find a clean way to silence these warnings without also eliminating the download progress output.

[github-actions[bot]]

Hey! This pull request targets the master branch. You should probably target dev instead. Make sure to read the contributing guidelines and edit the target branch if necessary.

[sparr]

Sorry about the wrong branch target. I'll try to get that fixed.

[AndreiCherniaev]

Sorry about the wrong branch target. I'll try to get that fixed.

Any news?