v0.1.0-alpha.4

Changes since alpha.3

• Sharper debug logging: now shows exactly which INI files were tried and whether they opened, the raw currentRotationPosition value found, every singer ID loaded from the DB, and the exact values present when is_playing can't match a current singer. Makes it straightforward to tell the difference between "INI not found", "key missing", "value not parseable", and "ID doesn't match any singer in rotation".