Deduplicate locale data tables

Some entries in tables were sub-strings (e.g. prefixes) of others.
Since we store start-index and length (with no need for terminators),
any entry that appears as a sub-string of an earlier entry can be
recorded without making a separate copy of its content, just by
recording where it appeared as a sub-string of an earlier entry.

(Sadly this doesn't apply to month- or day-names and their
short-forms: for those, we store ';'-joined lists.  Thus, although
each short-form is a prefix of its long-form, the short-form is stored
in a list with other short-forms; and this is not a prefix of the list
of matching long-forms.)

The savings are modest (780 bytes at present), but cost us nothing
except when running the python script that generates the data files
(it takes a little longer now), which usually only happens at a CLDR
update.

Change-Id: I05bdaa9283365707bac0190ae983b31f074dd6ed
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

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