Implement green color for checkmarks in support matrix tables

[tbazant]

Problem Description

While the UTF crossmark is naturally red, checkmark is normally black and is not so distinct. Greening it would help readability

[tomschr]

I've implemented now the colored text in the above PR.

Basically you need a processing instruction <?dbsuse color="..."?> wrapped inside a <phrase> or use the attribute role="color:...". The color key can hold several possible values:

• SUSE brand colors suse-jungle-green, suse-pine-green, suse-midnight-blue, suse-waterhole-blue, suse-mint, suse-persimmon, suse-fog
• ~"Typical" CSS color names aqua, black, blue, darkgray/darkgrey, fuchsia, gray/grey, green, lime, maroon, navy, olive, orange, purple, red, teal, white, yellow~
• ~RGB colors with the syntax #RRGGBB (wheres R, G, and B are a single hex digits)~

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If you want to try this out, here is a small procedure:

1. Clone the openSUSE/suse-xsl repo.
2. Switch to the 453-color-para_phrase branch.

3. Run daps with the --styleroot option. Replace $PATH_TO_CLONED_DIR with the directory from step 1.

   daps --styleroot=$PATH_TO_CLONED_DIR/suse2022-ns/ ...