(#31) Setup the emulator model

[robinmatz]

This would be my take on issue #31,
As you can see in the documentation, I propose that we publish this as an experimental feature, so that users are aware that this feature is not yet stable.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.65 ⚠️

Comparison is base (2cab2ba) 96.71% compared to head (76d3536) 96.06%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #107      +/-   ##
==========================================
- Coverage   96.71%   96.06%   -0.65%     
==========================================
  Files          12       12              
  Lines         700      712      +12     
  Branches       96       94       -2     
==========================================
+ Hits          677      684       +7     
- Misses         19       24       +5     
  Partials        4        4              

Flag	Coverage Δ
acceptance	84.55% <89.39%> (+0.69%)	⬆️
unit	91.29% <100.00%> (-2.00%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
Mainframe3270/keywords/commands.py	100.00% <ø> (ø)
Mainframe3270/keywords/read_write.py	100.00% <ø> (ø)
Mainframe3270/utils.py	100.00% <ø> (ø)
Mainframe3270/__init__.py	100.00% <100.00%> (ø)
Mainframe3270/keywords/__init__.py	100.00% <100.00%> (ø)
Mainframe3270/keywords/assertions.py	100.00% <100.00%> (ø)
Mainframe3270/keywords/connection.py	98.82% <100.00%> (+0.01%)	⬆️
Mainframe3270/keywords/screenshot.py	100.00% <100.00%> (ø)
Mainframe3270/keywords/wait_and_timeout.py	100.00% <100.00%> (ø)
Mainframe3270/librarycomponent.py	100.00% <100.00%> (ø)
... and 1 more

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[robinmatz]

@samuelpcabral , I am sorry, I know you removed these line breaks, but they are inserted automatically by isort and I haven't yet figured out how to prevent the tool from doing this.

I hope this is not an issue

[robinmatz]

The tests are failing because currently there are some announcements on pub400 that also include the string "pub400". This happens periodically, so I think I will change our acceptance tests to look for strings that are less likely to change.

[robinmatz]

I think the last commits fixed the pipeline, except for the host disconnected error, which we have no influence on, since pub400.com blocks too many requests from the same IP.

I saw that the unit tests on windows take oddly long, and I think it has to do with some tests in test_connection.py. I will fix those and then this PR is ready from my point of view.