2.0.0

• Updated Swift Tools to version 6.1.
• Removed the default field from several classes to meet the requirements of Swift 6.0 and higher:
  • FenSerialization.default
  • Rays.default
  • MovingTranslations.default
  • SanSerialization.default
• Migrated tests from XCTest to the modern Testing framework.
• Migrated documentation from Jazzy to DocC.
• Removed CocoaPods support.