src: log: Add function to get the current global logging status
src: log.c: Add string array containing name of log levels
src: uart_protocol.c: Implement another bunch of functions needed for logging
src: log.c: Make log_modules_names accessible
TODO: Add new items
src: color.h: Fix coding style guideline violation
src: Name header guards consistently
src: Move brightness handling functionality into own module
src: brightness.c: Make use of dynamic logging functionality