Move kivy.core.audio to kivy.core.audio_output, reserve kivy.core.audio_input for future use #8579

[pedroarduini]

Renamed audio module to audio_output refactoring all calls to the previous names.

Also, as demanded, reserved an audio_input module for future development.

[welcome[bot]]

Thanks for opening your first pull request here! 💖 Please check out our contributing guidelines.

[misl6]

Hi @pedroarduini ,

Looks like you added unrelated files in your commit (Cython-generated files, build script), Can you please do a cleanup and ping me when you're ready?

[pedroarduini]

Hey, thanks for noting.

Cleaned up the installation file and ran "make cleanup" to clean compiled files. Please let me know if there's anything else to clean

@misl6

[welcome[bot]]

Congrats on merging your first pull request! 🎉🎉🎉