Add colored CLI help formatting and respect NO_COLOR #109
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Compared to click's default formatter, this highlights options, usuage, headings and formats option lists in a linear style (descriptions of options are on a new line). Options are also aligned so that single-dash options like "-v" stand-out more. This will also respect the NO_COLOR envirornment variable now. Also adds a short "-g" option for "--group-errors". This is loosely inspired by spin [1]. [1] https://github.com/scientific-python/spin/blob/edbd6572f7fc53fa0914fe6337b1bb2599e457fa/spin/color_format.py
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