- rename the board class and files to MuziBaseBoard
- uppercase the build flags (MUZI_BASE, MUZI_BASE_SUPERIO)
- name the superIO envs muzi_base_{duo,uno}_superIO_companion_radio_ble so
build.sh picks them up
- set MAX_CONTACTS to 350 like the other variants
- move the pin setup from initVariant() into MuziBaseBoard::begin()