added mac audio_manager support

I was considering using it for a game when the audio_manager crashed on my mac; anyway just a very small patch that used the afplayer installed with mac to play the sounds.

I did not run the tests (because everytime I run it it crashes while loading the test_config file), but Planetoid seems to work fine. I am still quite unsure if the terminal display settings are correct. But yeah.... now you can actually run Hatchling on mac.