[ENH] Survival tables, CoxRegression model and learner

[JakaKokosar]

Issue

Description of changes

Includes

• [X] Code changes
• [ ] Tests
• [ ] Documentation

[codecov-commenter]

Codecov Report

Merging #27 (ee1c75d) into master (8d0bba4) will increase coverage by 6.23%. The diff coverage is 42.85%.

@@            Coverage Diff             @@
##           master      #27      +/-   ##
==========================================
+ Coverage   41.56%   47.80%   +6.23%     
==========================================
  Files           5        9       +4     
  Lines         996     1023      +27     
==========================================
+ Hits          414      489      +75     
+ Misses        582      534      -48     

Impacted Files	Coverage Δ
...ngecontrib/survival_analysis/evaluation/scoring.py	0.00% <0.00%> (ø)
orangecontrib/survival_analysis/modeling/cox.py	0.00% <0.00%> (ø)
...ntrib/survival_analysis/widgets/owcoxregression.py	0.00% <0.00%> (ø)
...urvival_analysis/widgets/owranksurvivalfeatures.py	0.00% <0.00%> (ø)
...rvival_analysis/widgets/owstepwisecoxregression.py	0.00% <0.00%> (ø)
orangecontrib/survival_analysis/widgets/data.py	100.00% <100.00%> (ø)
...trib/survival_analysis/widgets/owassurvivaldata.py	100.00% <100.00%> (ø)
...contrib/survival_analysis/widgets/owkaplanmeier.py	94.19% <100.00%> (+0.16%)	:arrow_up:

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