[perl #77818] Teach Perl about Unicode named character sequences

# New Ticket Created by  karl williamson 
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This series of commits mainly adds to Perl support for Unicode named 
character sequences.  They still aren't accepted in regular expression 
bracketed character classes, as those currently can handle only single 
character elements.

There are also some small performance enhancements to charnames, and 
more randomized testing.

This patch is also on github at git://github.com/khwilliamson/perl.git
branch charnames.

• [perl #77818] Teach Perl about Unicode named character sequences by karl williamson