Add coloured console output to simple logging

[adamralph]

ConsoleOutLoggerFactoryAdapter is great for quickly plugging in a console logger.

It would be even greater if we could have a simple ColoredConsoleOutLoggerFactoryAdapter. Different colours for each logging level is just so so pretty and readable 😉.

I understand that you probably don't want to lump too many simple loggers into the library and they should be kept simple, but I think this implementation would indeed be simple and lots of people would use it.

Alternatively, we could have a new constructor for ConsoleOutLoggerFactoryAdapter with a bool useColour parameter.

[danbarua]

+1, you beat me to it.