add the word Concept a bunch of places

[Yurlungur]

PR Summary

While integrating The current develop branch of spiner into singularity-eos, @mauneyc-LANL encountered some errors which I suspect are missing types in the SFINAE concept enforcement in spiner. This branch hopefully fixes the issue by adding the relevant type declarations.

PR Checklist

• [ ] Code is formatted. (You can use the format_spiner make target.)
• [ ] Adds a test for any bugs fixed. Adds tests for new features.
• [ ] If preparing for a new release, update the version in cmake.

[mauneyc-LANL]

Yes, this fixes the specific issue I was having.

[Yurlungur]

Merged