* fixed#16170: Random crash in alGenBuffers(AudioCache::readDataTask) at startup.
* Minor fix: should -> may
* Minor fix: updates comments.
* Update comment.
* Comment fix again.
* [audio] Fixes some issues while stop/uncache right after play/preload on OSX/iOS platform.
* Better state control in AudioCache.
* Adds State enum class which contains INITIAL, LOADING, READY, FAILED states.
* AudioPlayer::destroy should check AudioCache::_isAudioLoaded flag, otherwise, app will freeze in cpp-tests/NewAudioEngineTest/6:Test invalid audio file.
* Should check whether state is INITIAL in the destructor of AudioCache.
* Adds test case for switching play state frequently.
* Skips invoking reading data callback if cache's state is INITIAL.
* Variables initialization for AudioCache class and fixes protential missing delete AL buffers.
Ported tests:
- js-tests
- cpp-tsts
- lua-tests
- game-controller tests
all of them working, but most of the tests can't be navigated
since they expect a controller.