bl00mbox: api refactor (mypy help from dx)

docs/badge/bl00mbox.rst

python_payload/apps/demo_harmonic/__init__.py

python_payload/apps/demo_melodic/__init__.py

python_payload/apps/otamatone/__init__.py

python_payload/apps/shoegaze/__init__.py

python_payload/apps/simple_drums/__init__.py

python_payload/bl00mbox/_patches.py

python_payload/bl00mbox/_user.py

python_payload/mypystubs/bl00mbox/_patches.pyi

python_payload/mypystubs/bl00mbox/_user.pyi