2.9

Changelog:

• NEW: new isMarkedForRemoval entity extension function (#153)
• NEW: systems can now be added and removed after world configuration (#145)
• NEW: new systemOrNull function (#146)
• NEW: new first and firstOrNull with predicate argument function on family (#147)
• NEW: new update method on world using Kotlin's Duration (#152) [thanks to @RefuX]
• UPDATE: update following versions
  • gradle 8.7 -> 8.10
  • Kotlin 2.0.0 -> 2.0.20
  • kotlinx-serialization: 1.7.1 -> 1.7.2