Audio playback

[craigthomas]

This PR adds audio playback capability. No unit tests were added to cover this functionality. This PR closes #23

[codecov]

Codecov Report

Attention: Patch coverage is 12.72727% with 48 lines in your changes missing coverage. Please review.

Project coverage is 90.09%. Comparing base (189fee5) to head (eeabfb3).

Files with missing lines	Patch %	Lines
src/cpu.c	12.72%	48 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #53      +/-   ##
==========================================
- Coverage   91.68%   90.09%   -1.59%     
==========================================
  Files           9        9              
  Lines        2681     2736      +55     
  Branches      237      252      +15     
==========================================
+ Hits         2458     2465       +7     
- Misses        218      266      +48     
  Partials        5        5              

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