[css-text] Make control characters visible. <http://lists.w3.org/Archives/Public/www-style/2014Oct/0259.html> Also clean up some Unicode property linking.

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extra : rebase_source : 8b8831e64c46a13adba42d21ef846646f34f9343
[css-text] S -> So

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extra : rebase_source : e29ff8e27b253f997be9b87b4d6f017a6a6b9e50