1108 Reuse more code in Initialization Process of ODE models

[HenrZu]

Changes and Information

Please briefly list the changes (main added features, changed items, or corrected bugs) made:

• Non model dependent io function of the population, case, divi and vaccination data are now saved centrally.

If need be, add additional information and what the reviewer should look out for in particular:

Merge Request - Guideline Checklist

Please check our git workflow. Use the draft feature if the Pull Request is not yet ready to review.

Checks by code author

• Every addressed issue is linked (use the "Closes #ISSUE" keyword below)
• New code adheres to coding guidelines
• No large data files have been added (files should in sum not exceed 100 KB, avoid PDFs, Word docs, etc.)
• Tests are added for new functionality and a local test run was successful (with and without OpenMP)
• Appropriate documentation for new functionality has been added (Doxygen in the code and Markdown files if necessary)
• Proper attention to licenses, especially no new third-party software with conflicting license has been added
• (For ABM development) Checked benchmark results and ran and posted a local test above from before and after development to ensure performance is monitored.

Checks by code reviewer(s)

• Corresponding issue(s) is/are linked and addressed
• Code is clean of development artifacts (no deactivated or commented code lines, no debugging printouts, etc.)
• Appropriate unit tests have been added, CI passes, code coverage and performance is acceptable (did not decrease)
• No large data files added in the whole history of commits(files should in sum not exceed 100 KB, avoid PDFs, Word docs, etc.)
• On merge, add 2-5 lines with the changes (main added features, changed items, or corrected bugs) to the merge-commit-message. This can be taken from the briefly-list-the-changes above (best case) or the separate commit messages (worst case).

[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 5 lines in your changes missing coverage. Please review.

Project coverage is 97.01%. Comparing base (c78bafd) to head (a841c90).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
cpp/memilio/io/parameters_io.h	84.61%	4 Missing ⚠️
cpp/memilio/io/parameters_io.cpp	95.65%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1163      +/-   ##
==========================================
+ Coverage   96.95%   97.01%   +0.05%     
==========================================
  Files         148      149       +1     
  Lines       13713    13613     -100     
==========================================
- Hits        13296    13206      -90     
+ Misses        417      407      -10     

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