Allow configurable color reset code

I found the original context behind why git-radar had custom color reset
codes.  It sums up to playing more nicely with a background color, such
as something used in a "power line" style prompt.  This use-case makes
sense, so re-introduce a config variable to control this.

We still don't need an individual reset value for each prompt element,
so keep it to the single general one, defaulted to \033[0m.

Link: https://github.com/michaeldfallen/git-radar/issues/14
Signed-off-by: Matt Hunter <m@lfurio.us>

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