[utils] Request for spacing and flex utility classes

[bborn]

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Feature Request

I love Fomantic, and find that it covers about 90% of my needs. One thing I think would be really useful would be simple utility classes for spacing (margin/padding) and flex layout. We have something similar for text already (ui text-small) so I think it could make sense in the library.

Example (if possible)

Spacing: <div class="margin-x-large"></div>

Flex - see https://tailwindcss.com/docs/flex or https://primer.style/css/utilities/flexbox

I think these utilities, combined with FUI's existing semantic class system, would be really powerful.

[lubber-de]

Duplicate of #22