settings: audio config + appeareance

python_payload/apps/appearance/__init__.py

python_payload/apps/appearance/audio_config/__init__.py

python_payload/apps/appearance/audio_config/flow3r.toml

python_payload/apps/appearance/flow3r.toml

python_payload/apps/audio_config/__init__.py

python_payload/apps/audio_config/flow3r.toml

python_payload/apps/graphics_mode/__init__.py

python_payload/st3m/application.py

python_payload/st3m/processors.py

python_payload/st3m/run.py

python_payload/st3m/settings.py

python_payload/st3m/settings_menu.py

sim/fakes/leds.py

sim/fakes/sys_display.py