Bugfixes and Improvements

• Only apply minimum ID3 cue duration when cue does not have one. #2964 resolves #2963

This patch fixes a regression introduced in v0.14.8 where we applied a minimum duration 0.25s to all metadata cues. All cues must have a positive duration, but we shouldn't modify valid ones, since those cue ranges may be considered critical to application logic.

Summary
v0.14.8...v0.14.9