chore(build): switch build structure to working on base modules, simplify imports

[tranzystorekk]

Zig 0.14 encourages cleaner build script structure by reusing modules: https://ziglang.org/download/0.14.0/release-notes.html#Creating-Artifacts-from-Existing-Modules

This, besides the obvious general improvement, allows us to import all internal modules like wav via the local-file @import("wav.zig") mechanism, which makes the whole project more naturally simply include the code it needs, where it needs it.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.04%. Comparing base (5bc4794) to head (04ec39f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #41   +/-   ##
=======================================
  Coverage   66.04%   66.04%           
=======================================
  Files           4        4           
  Lines         162      162           
=======================================
  Hits          107      107           
  Misses         55       55           

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[orhun]

Cool! Should I cut a new release for this or can we wait until a new feature lands / Zig version is updated?

[tranzystorekk]

No release needed :)