Fix #24813 Implement exporting of LRC lyric files

[pacebes]

Resolves: #24813

• Creates a new module to deal with exporting LRC files

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• Each commit's message describes its purpose and effects, and references the issue it resolves
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• There are no unnecessary changes
• The code compiles and runs on my machine, preferably after each commit individually
• I created a unit test or vtest to verify the changes I made (if applicable)

[cbjeukendrup]

I've made a number of review fixes myself; here's one more thing to consider: