feat(local): load same-name lrc files

[SharnavM]

Adds support for loading local .lrc files for music if they exist.

• Local .lrc files take priority over internet lyrics.
• Internet lyrics are used as a fallback if the .lrc file doesn't exist or is empty, only if the internet privacy setting is on.
• Changed the label for the lyrics privacy option to match the new behavior.
• The build compiles successfully for all supported platforms. Manual testing has been completed on Windows; manual testing on macOS and Linux remains.

Partially addresses #398.

[imizgun]

Hello, Sharnav. Thank you for your contribution.
We decided to keep implementing a feature started by you from PR #632, since it was more lived up to the current branch state.
Anyway, thank you for your PR.