750 add file based io to cli

[reneSchm]

Changes and Information

Please briefly list the changes made, additional Information and what the Reviewer should look out for:

• Added command line options and functions to read or write parameters from or to a file.

Please check if the naming and description of built-in options is good (you may use the example, i.e. cli_example --help).

Merge Request - Guideline Checklist

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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
• 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

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 and code coverage 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.)

Closes #750

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (84a3d3b) 94.20% compared to head (e5e0052) 94.82%.
Report is 23 commits behind head on main.

❗ Current head e5e0052 differs from pull request most recent head 7d97200. Consider uploading reports for the commit 7d97200 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #751      +/-   ##
==========================================
+ Coverage   94.20%   94.82%   +0.61%     
==========================================
  Files         108      110       +2     
  Lines        8510     8616     +106     
==========================================
+ Hits         8017     8170     +153     
+ Misses        493      446      -47     

Files	Coverage Δ
cpp/memilio/io/cli.h	100.00% <100.00%> (ø)

... and 11 files with indirect coverage changes

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[HenrZu]

Look good. Only some small comments :)