fixes #1533

[JonasKlamroth]

Related Issue

This pull request addresses #1533 .

Intended Change

This replaces the fix seperator "," with a static final String which may be set arbitrarily. This resolved the described problems in the description of the issue.

Type of pull request

• [ x ] Bug fix (non-breaking change which fixes an issue)
• [ ] Refactoring (behaviour should not change or only minimally change)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ x ] There are changes to the (Java) code
• [ ] There are changes to the taclet rule base
• [ ] There are changes to the deployment/CI infrastructure (gradle, github, ...)
• [ ] Other:

Ensuring quality

• [ x ] I made sure that introduced/changed code is well documented (javadoc and inline comments).
• [ x ] I made sure that new/changed end-user features are well documented (https://github.com/KeYProject/key-docs).
• [ ] I added new test case(s) for new functionality.
• [ x ] I have tested the feature as follows: Saved CSV-statistics and loaded it. Saved proof files and loaded them.
• [ x ] I have checked that runtime performance has not deteriorated.

Additional information and contact(s)

The contributions within this pull request are licensed under GPLv2 (only) for inclusion in KeY.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 37.91%. Comparing base (1fb0c10) to head (dd1a99f). Report is 11 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3423 +/- ## ============================================ + Coverage 37.77% 37.91% +0.14% - Complexity 17031 17069 +38 ============================================ Files 2076 2076 Lines 126950 127019 +69 Branches 21381 21388 +7 ============================================ + Hits 47952 48164 +212 + Misses 73092 72949 -143 Partials 5906 5906 ```

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[wadoon]

force pushed for reformatting

[wadoon]

On the other side, we might want to migrate from csv to something more robust like Json. The ci-tool offers already such an export for further script-based analysis.