Add background and foreground color on span tests#105

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btsimonh wants to merge 3 commits intow3c:mainfrom btsimonh:color

Commits on Oct 10, 2022

add color tests:
btsimonh
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Commits on Oct 11, 2022

Remove refs to style p1
btsimonh
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Commits on Oct 13, 2022

Move to imsc1/ folder, reduce to Color010.ttml and BackgroundColor011.ttml
btsimonh
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