unloadAll method
Unloads all previously preloaded HAC and OGG files.
Unloading all files frees up resources used by the preloaded files.
Later calls to play, playHAC, and playOGG for previously preloaded
files may have higher latency.
Returns a Future that completes when all preloaded files have been
unloaded.
Implementation
Future<void> unloadAll() {
return HapticlabsPlayerPlatform.instance.unloadAll();
}