New (2022) v_P could simplify this plugin

I found out that visual mode `P` (capital) doesn't modify unnamed register as of this PR:

https://groups.google.com/g/vim_dev/c/H_HzHcGXNxA

Is the new `v_P` enough to replace `ReplaceWithRegisterVisual`?

Also I can see that temporarily saving unnamed register and using `v_p` is used not only for the visual mode mapping but others as well.