Add missing files from last commit:

Move Unicode <-> ku/ten mapping into the individual codec modules.
Mapping is based on existing iconv data for single-byte encodings,
and included for several, bu

Add missing files from last commit:

Move Unicode <-> ku/ten mapping into the individual codec modules.
Mapping is based on existing iconv data for single-byte encodings,
and included for several, but not all, multibyte encodings.

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