Ignore tabs in expression

[d3dave]

Fixes #87

Constant expression can contain tabs as whitespace just like spaces. This PR tests for this and fixes the expression parser to ignore the tabs just like spaces.

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[d3dave]

@DissectBot agree

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.32%. Comparing base (95a4928) to head (34ac0db).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #88   +/-   ##
=======================================
  Coverage   89.32%   89.32%           
=======================================
  Files          21       21           
  Lines        1929     1929           
=======================================
  Hits         1723     1723           
  Misses        206      206           

Flag	Coverage Δ
unittests	89.32% <100.00%> (ø)

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[Schamper]

If you fix the linter this is good to go 👍