Split color scheme CSS from screen.css

[danielfdickinson]

This makes it easier for users to create custom colour schemes

[sonarcloud[bot]]

Quality Gate passed

Kudos, no new issues were introduced!

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0 Security Hotspots
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0.0% Duplication on New Code

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[bowman2001]

I like the idea of an optional custom color scheme. But we need to separate the handling of CSS properties (variables) from the handling of additional classes.

CSS properties need to be placed near the top of the resulting stylesheet. Custom classes which may override existing ones need to follow a the bottom.

Please raise issues for your feature requests before submitting pull requests.

[danielfdickinson]

Thank, and will do.