src: config.h: Rename LOG_MAIN_BRIGHTNESS to LOG_BRIGHTNESS
src: datetime: Make datetime_get() return const pointer
src: uart_protocol.c: uart_protocol_output_args_hex(): Rename argument
src: uart_protocol.c: Implement uart_protocol_input_args_hex()
Merge branch 'refactor/uartprotocol'
src: uart.c: uart_getc_nowait(): Rename argument
src: uart: Name string arguments consistently
src: uart: uart_flush_output(): Add todo item
TODO: Remove item already implemented
Merge branch 'master' into feat/log

Conflicts:
	TODO
	src/brightness.c
	src/config.h
	src/uart_protocol.c