DEV: Updates to ITWM BaseMCO class to utilise WorkflowEvaluator

[flongford]

This PR implements updates required by the refactoring of force_bdss in force-h2020/force-bdss/pull/232. It is very similar in content to force-h2020/force-bdss-plugin-enthought-example/pull/34

It simplifies the MCO class by using the in built functionalities of the new WorkflowEvaluator class, removing any ISinglePointEvaluator subclasses.

A new subclass SubprocessWorkflowEvaluator is also included to spawn a subprocess that calls another force_bdss executable to perform the same evaluation (current functionality implemented in both force-bdss-plugin-enthought-example and force-bdss-plugin-itwm-example BaseMCO subclasses).

Note: this branch is pinned to force-bdss/enh/refactor-factory-plugin and should not be merged before force-h2020/force-bdss/pull/232 is closed

Change Log

• ISinglePointEvaluator, InternalSinglePointEvaluator and SubprocessSinglePointEvaluator classes removed
• New class SubprocessWorkflowEvaluator, which is a subclass of WorkflowEvaluator
• BaseMCO subclasses run methods now expect a evaluator argument, rather than model. These methods have also been amended to call evaluator.evaluate(<list of parameters>) to calculate the KPIs at each data point.
• All factory.plugin.id references updated to factory.plugin_id
• All factory.plugin.application references removed

Known Issues

• The codecov is low (linked to #41), and should be improved for the BaseMCO class at least before merging

[codecov-io]

Codecov Report

Merging #47 into master will increase coverage by 4.48%. The diff coverage is 91.66%.

@@            Coverage Diff             @@
##           master      #47      +/-   ##
==========================================
+ Coverage    73.6%   78.09%   +4.48%     
==========================================
  Files          27       28       +1     
  Lines         557      557              
  Branches       38       30       -8     
==========================================
+ Hits          410      435      +25     
+ Misses        141      116      -25     
  Partials        6        6

Impacted Files	Coverage Δ
itwm_example/mco/subprocess_workflow_evaluator.py	100% <100%> (ø)
itwm_example/mco/mco.py	81.01% <62.5%> (+18.39%)	:arrow_up:

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