Remove deprecated Unicode files

These files were once apparently intended for use by modules to
supplement the core Unicode handling.  They contain tables suitable for
use by Perl code of the portions of the Unicode character database
about changing the case of characters and finding the numeric value of a
given \d character, in a form suitable for use by perl code.  In
particular, they were designed for fast access using the swash mechanism
that has since been removed.

Now, Unicode::UCD now contains more convenient methods of accessing
the data these contain, and the use of these files has been deprecated
since 5.16.  I could not figure out a way to force a message should
someone open and read one of these files, but each of their texts say
that the file may be removed without notice at any time.  I did not find
any uses on cpan of them.

Unicode is adding new properties that the format of these files will
not be able to handle.  Consequently I'm coming up with a new format.
Though these files don't contain the new properties, their existence
means having the burden of having to maintain two separate mechanisms.
Better to have just one mechanism, suitable for going forward.

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