Release v18

[pokornyd]

Motivation

Fixes #377

Target set to .NET 8.0, all references to project modified to environment

Checklist

• [ ] Code follows coding conventions held in this repo
• [ ] Automated tests have been added
• [ ] Tests are passing
• [ ] Docs have been updated (if applicable)
• [ ] Temporary settings (e.g. variables used during development and testing) have been reverted to defaults

How to test

If manual testing is required, what are the steps?

[codecov[bot]]

Codecov Report

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

Project coverage is 88.57%. Comparing base (665b34b) to head (23e7015).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #390 +/- ## ======================================= Coverage 88.57% 88.57% ======================================= Files 129 129 Lines 2775 2775 Branches 345 345 ======================================= Hits 2458 2458 Misses 185 185 Partials 132 132 ```

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