(#92) Enable shell-like syntax in extra_args from file

[robinmatz]

Resolves #92

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (f7b458e) 94.32% compared to head (c78d471) 94.32%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master      #91   +/-   ##
=======================================
  Coverage   94.32%   94.32%           
=======================================
  Files           4        4           
  Lines         581      582    +1     
  Branches       90       90           
=======================================
+ Hits          548      549    +1     
  Misses         28       28           
  Partials        5        5           

Flag	Coverage Δ
acceptance	80.06% <100.00%> (-0.49%)	⬇️
unit	88.14% <100.00%> (+0.02%)	⬆️

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Impacted Files	Coverage Δ
Mainframe3270/x3270.py	99.66% <100.00%> (+<0.01%)	⬆️

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