windows_unit_test_fixes

[cmmorrow]

• Added a fix to catch windows paths in parse_variables().
• Fixed a bug in delete_new_files() that would raise an exception if trying to delete a non-empty directory when cleaning up a directory that started off empty.
• Updated unit tests.

Closes #99

[codecov-commenter]

Codecov Report

Merging #103 (6f28a18) into main (b10ce19) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #103   +/-   ##
=======================================
  Coverage   96.52%   96.53%           
=======================================
  Files          10       10           
  Lines        1727     1731    +4     
=======================================
+ Hits         1667     1671    +4     
  Misses         60       60           

Flag	Coverage Δ
unittests	96.53% <100.00%> (+<0.01%)	:arrow_up:

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Impacted Files	Coverage Δ
build_magic/actions.py	90.58% <100.00%> (ø)
build_magic/core.py	98.53% <100.00%> (+0.02%)	:arrow_up:

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