Reorganize S4 code and documentation

[hsloot]

Related issues

None

Checklist

• R CMD CHECK successful
• tests included
• documentation included or updated
• commit messages follow commit guidelines

Optional, but recommended:

• code passes lintr::lint_package() without errors

Description

Proposed changes:

• Re-organize S4 code
• Adapt documentation if required

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.85%. Comparing base (6e3272a) to head (f7bf5d6).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #117      +/-   ##
==========================================
+ Coverage   95.78%   95.85%   +0.07%     
==========================================
  Files          46       55       +9     
  Lines        1399     1399              
==========================================
+ Hits         1340     1341       +1     
+ Misses         59       58       -1     

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