Switch the procs back to templates as templates are faster?

[kaushalmodi]

This would involve mostly reverting 22609c8 .

https://gitter.im/nim-lang/Nim?at=60c0e98f19b46c60b179ef72

/cc @treeform

[treeform]

I would add a benchmark that proves templates are faster then inline procs. That might change in the future as Nim improves?

[kaushalmodi]

I would add a benchmark

I haven't done a benchmark before.

Will you be willing to provide a PR to enable that in https://github.com/kaushalmodi/ptr_math/blob/main/.github/workflows/test.yml ?