- setup uart at boot instead of delaying until some module needs it
removes global `SERIAL_BAUDRATE` and `DEBUG_PORT` in favour or
globally accessible numbered port configurations with `MODULE_NAME_PORT`
- automagically enable uart support for sensors that need it
- allow every sensor to configure uart0 (normal and swapped), uart1
and an optional software-serial mode support with an extra build flag
remove individual includes across the sensors
- settings queries and runtime port configuration (prefixed with uart)
- update dependencies header to cross-reference used ports at build time
- update deprecations header with serial baudrate notice