Split question setting for border into three separate fields

[matty22]

What is the current behavior?

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The border setting for questions is set to use the CSS shorthand for borders (ie. 1px solid #000000).

What is the expected behavior?

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This should be split into three separate fields. One for border width, one for border type, and one for border color. Border width should be a text input field that assume pixel unit of measurement, border type should be a toggle button group with options for solid/dashed/dotted, border color should be a color picker

If this issue is a question or feature request, what is the motivation / use case for changing the current behavior?

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Splitting these out into separate fields will help users who are unfamiliar with CSS and the border shorthand property