[FIX] ROC and LiftCurve: Store context settings

[janezd]

Issue

Fixes #4115: Lift curve and ROC Analysis did not have context settings. (Also because there was no suitable handler before #3881; #3881 implemented such a handler for the new calibration plot widget and even noticed that Lift Curve and ROC Analysis can now use it :).

Description of changes

Use EvaluationResultsContextHandler in the two widgets.

Includes

• Code changes
• Tests
• Documentation

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@1fb5f8a). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master    #4138   +/-   ##
=========================================
  Coverage          ?   85.67%           
=========================================
  Files             ?      389           
  Lines             ?    69677           
  Branches          ?        0           
=========================================
  Hits              ?    59694           
  Misses            ?     9983           
  Partials          ?        0