Fixed ID3v2 regressions from version 1.1.12
Fixed playback-getting-stuck bugs with fade-on-track-advance enabled.
ID3v2 compliance changes: multiple TXXX allowed again, semicolon used for multiple genre separator.
Changed ID3v2.3 TYER/TDAT handling, now merged into one DATE field formatted as YYYY-MM-DD.
Fixed incorrect volume control behavior when cycling output methods.
