bl00mbox: better signal muxing

components/bl00mbox/.clang-tidy

components/bl00mbox/CMakeLists.txt

components/bl00mbox/bl00mbox_plugin_registry.c

components/bl00mbox/plugins/distortion.c

components/bl00mbox/plugins/mixer.c

components/bl00mbox/plugins/multipitch.c

components/bl00mbox/plugins/multipitch.h

components/bl00mbox/plugins/sampler.c

components/bl00mbox/plugins/sequencer.c

components/bl00mbox/plugins/sequencer.h

components/bl00mbox/radspa/radspa_helpers.c

components/bl00mbox/radspa/radspa_helpers.h

python_payload/apps/simple_drums/__init__.py

python_payload/bl00mbox/_patches.py

python_payload/mypystubs/bl00mbox/_patches.pyi