src: Implement module for dynamic logging functionality
src: ldr: Make use of functionality provided by logging module
src: log: Introduce prefix to log messages
src: log.c: log_output_va(): Use uart_puts_P() for constant string
src: log.h: Fix coding style guideline violation
src: log: Implement output of module name including separator
src: ldr.c: Remove prefix from logging message
src: uart_protocol.c: Rename _ldr_brightness() to _brightness_get()
doc: UART_PROTOCOL.md: Update brightness command
src: uart_protocol: Add support for dynamic logging