v4.1.1 of audio_in_app

A Flutter package for playing audio files. Ideal for games or applications with sound. Changelog excerpt: - Fix (crash on cold start): free the native SoLoud engine on AppLifecycleState.detached. The engine is a native (C++) singleton that outlives the Dart isolate within the same process (e.g. Android re-creating the Activity without killing the process). Previously the engine kept its FFI NativeCallablelisteners pointing at the destroyed isolate, so a later native voiceEnded/stateChangedaborted the VM with SIGABRT "Callback invoked after it has been deleted"on the next cold start. Th[...]