Support all Robot Framework time formats (#65)

[robinmatz]

Resolves #65

Todo:

• Implement feature
• Write utests
• Update docs
• Fix atests

[codecov-commenter]

Codecov Report

Merging #66 (0630d40) into master (76b589d) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #66      +/-   ##
==========================================
+ Coverage   94.77%   94.83%   +0.06%     
==========================================
  Files           4        4              
  Lines         574      581       +7     
  Branches      105      106       +1     
==========================================
+ Hits          544      551       +7     
  Misses         26       26              
  Partials        4        4              

Flag	Coverage Δ
acceptance	79.69% <79.41%> (+0.24%)	⬆️
unit	87.95% <100.00%> (+0.14%)	⬆️

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Impacted Files	Coverage Δ
Mainframe3270/__init__.py	100.00% <100.00%> (ø)
Mainframe3270/x3270.py	100.00% <100.00%> (ø)

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