Remove trivial super delegations

[timokau]

Description

Most of the delegations were truly trivial, some others needed the more specific mixins moved first in the inheritance list. This removes a lot of boilerplate code that sometimes even makes up the majority of the classes.

Motivation and Context

Some more cleanup to make future changes easier and the code more maintainable.

How Has This Been Tested?

Testsuite & pre-commit.

Does this close/impact existing issues?

No, just maybe related to #146.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.

[codecov[bot]]

Codecov Report

Merging #151 into master will increase coverage by 5.37%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #151      +/-   ##
==========================================
+ Coverage   51.25%   56.63%   +5.37%     
==========================================
  Files         113      113              
  Lines        6848     6558     -290     
==========================================
+ Hits         3510     3714     +204     
+ Misses       3338     2844     -494     

Impacted Files	Coverage Δ
csrank/choicefunction/baseline.py	34.48% <ø> (-1.01%)	:arrow_down:
csrank/choicefunction/generalized_linear_model.py	85.18% <ø> (-1.03%)	:arrow_down:
csrank/core/ranknet_core.py	97.72% <ø> (ø)
...et_reader/choicefunctions/choice_data_generator.py	14.03% <ø> (-2.36%)	:arrow_down:
...r/discretechoice/discrete_choice_data_generator.py	18.91% <ø> (-1.60%)	:arrow_down:
...der/objectranking/object_ranking_data_generator.py	23.33% <ø> (-1.67%)	:arrow_down:
csrank/discretechoice/baseline.py	57.14% <ø> (+2.14%)	:arrow_up:
csrank/discretechoice/generalized_nested_logit.py	88.80% <ø> (-0.52%)	:arrow_down:
csrank/discretechoice/mixed_logit_model.py	86.48% <ø> (-1.02%)	:arrow_down:
csrank/discretechoice/multinomial_logit_model.py	86.11% <ø> (-1.07%)	:arrow_down:
... and 40 more