531da8a1c0
* Changed LastPlayed field from string to nullable DateTime Added ApplicationData.LastPlayedString property Added NullableDateTimeConverter for the DateTime->string conversion in Avalonia * Added migration from string-based last_played to DateTime-based last_played_utc * Updated comment style * Added MarkupExtension to NullableDateTimeConverter and changed its usage Cleaned up leftover usings * Missed one comment