Unity 2018 and .NET 3.5 support

[zdickinsonfugro]

Removed all instances of interpolated strings from editor scripts so we don't get compiler errors on old versions of .NET in Unity 2018

Changes

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Related Issues

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Related PRs

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Checklist

• Read the contribution guide and accept the
  code of conduct
• [Not needed] Docs (If new inputs or outputs have been added or changes to behavior that should be documented. Please make a PR
  in the documentation repo)
• [Not needed] Readme (updated or not needed)
• [Not needed] Tests (added, updated or not needed)

[GitHub Actions]

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.99%. Comparing base (fc0a52b) to head (92e3173).

❗ Current head 92e3173 differs from pull request most recent head bf8ada8. Consider uploading reports for the commit bf8ada8 to get more accurate results

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Additional details and impacted files

@@           Coverage Diff            @@
##             main     #633    +/-   ##
========================================
  Coverage   36.99%   36.99%            
========================================
  Files          77       77            
  Lines        3122     3122            
  Branches      609      645    +36     
========================================
  Hits         1155     1155            
+ Misses       1967     1824   -143     
- Partials        0      143   +143     

see 37 files with indirect coverage changes

[timcassell]

Proper fix for #309. 👍

[timcassell]

Probably should add a test to prevent regressions.