Handle emoji selector (variant selector 16)

[waf]

Handle Variant Selector 16 (VS16) correctly. If VS16 is present, the character is rendered as an emoji and will display as 2 columns in the terminal.

Note that this is getting into terminal-specific behavior -- but I think following the way that modern terminals display emoji is the best path.

https://en.wikipedia.org/wiki/Variation_Selectors_(Unicode_block)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.5%. Comparing base (716648d) to head (71210cb).

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #292   +/-   ##
=====================================
  Coverage   84.5%   84.5%           
=====================================
  Files         47      47           
  Lines       3950    3952    +2     
  Branches     658     660    +2     
=====================================
+ Hits        3340    3342    +2     
  Misses       450     450           
  Partials     160     160           

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