v1.6.0 (72) Optional characters for BMP completeness (2025-12-26)

• Fulfilled full coverage of Basic Multilingual Plane by adding toggle settings for optional characters (which may not have system font support)
• Updated stroke input data to Conway Stroke Data v2.0.0
  • Adds optional characters U+9FD1 鿑 to U+9FFF 鿿
  • Adds optional characters U+4DB6 䶶 to U+4DBF 䶿
  • Adds optional character 𠀤
  • Adds character 𠮟
  • Adds characters 𠂇𠦝𡯂𤴓𦉪𨸏
  • Adds characters 𠓗𠓾𣁾𤾩
  • Adds optional character 𫟷
• Upgraded Android Gradle Plugin to 8.13.2