Fixing core.atomic

[Johan Engelen]

On Sunday, 30 May 2021 at 20:41:29 UTC, rm wrote:
> I plan on making core.atomic more consistent and easier to use. 
> Please provide me with your feedback.
>
>
> https://github.com/rymrg/drm/blob/main/atomic.d
> https://github.com/rymrg/drm/blob/main/atomic_rationale.md

I would also make the template accept more than just integral 
types, and only add the increment/binop functions for integral 
types.