Add `WHIPPER_COLOR_LOG` env var to color log output

[CommandMC]

If WHIPPER_COLOR_LOG is set, whipper will now attempt to import the coloredlogs package and install it to add color to log output

I've found this to be much more readable, especially if there's one warning/error among a sea of info messages (say if one track of a disc failed to rip)

Note that this only affects the log printed to stdout, not the rip log files. coloredlogs also makes sure that the output stream is a tty before enabling color, so piped output still works fine