Add the opt_stylize() method

[rich-iannone]

This adds in the opt_stylize() method. With it you can quickly style a table with a carefully curated set of background colors, line colors, and line styles. There are six styles to choose from and they largely vary in the extent of coloring applied to different table locations. Some have table borders applied, some apply darker colors to the table stub and summary sections, and, some even have vertical lines. In addition to choosing a style preset, there are six color variations that each use a range of five color tints. Each of the color tints have been fine-tuned to maximize the contrast between text and its background. There are 36 combinations of style and color to choose from.

Fixes: #165

[machow]

I left a suggestion on potentially creating a class to do the mapping, but feel free to merge and just create an issue if we want to punt!