Update input files for the code-generator and tests.
Added emoji-data.txt for new rule with how to handle emoji.

Unicode have simpliefied the rules for emoji grapheme-clusters:
From:
 GB10 (E_Base | EBG) Extend* × E_Modifier
 GB11 ZWJ × (Glue_After_Zwj | EBG)
To:
 GB11 \p{Extended_Pictographic} Extend* ZWJ × \p{Extended_Pictographic}

Update the code generator to handle the new way.

A base for unicode functions, not intended to be a user api.

Whitespace returns a reasonable subset of non nobreak whitespace
characters.

Implementation notes:

Make function clauses instead of using arrays and store tuples instead
of maps to save space.