More Mac OS and general typing improvements

[waf]

• Switch from level-2 to level-1 control sequences (https://invisible-island.net/xterm/ctlseqs/ctlseqs.html) to fix handling of uppercase characters
• Fix handling of combining characters with zero width that still need to be rendered (e.g. tone marks in Thai)

[codecov]

Codecov Report

❌ Patch coverage is 52.63158% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.9%. Comparing base (c207b83) to head (b13c00b).

Files with missing lines	Patch %	Lines
src/PrettyPrompt/Console/KeyPress.cs	50.0%	7 Missing and 2 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #298     +/-   ##
=======================================
- Coverage   86.0%   85.9%   -0.2%     
=======================================
  Files         47      47             
  Lines       4019    4030     +11     
  Branches     671     676      +5     
=======================================
+ Hits        3459    3463      +4     
- Misses       397     402      +5     
- Partials     163     165      +2     

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