[3.0] subtitle: allow lowercase hex colors

Backport of !3559 (merged)

changed milestone to %3.0.x maintenance

added Component::Text Rendering label

added MRStatus::Reviewable label

approved this merge request

added MRStatus::Acceptable label and removed MRStatus::Reviewable label

added MRStatus::Accepted label and removed MRStatus::Acceptable label

MR Acceptance result

This MergeRequest has been Accepted! Congratulations.

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merged

changed milestone to %3.0.19