refactor(shada): replace macros taking macros and code fragments

I guess these kinds of DRY techniques are kinda cutesy but unfortunately
I cannot expand macros invoking macros with various kind of syntax
fragments and back-references to local variables, at the same time
as I try to understand what is actually going on when you :wshada or :rshada
your jump marks, some of which having fname:s in them and some not.

This replaces it with four spelled out loops, although it is fine to
keep the memmove() related code generic in the item size just by passing a
runtime parameter (we have generics at home). Galaxy brain -03 -flto compilers
are gonna inline it anyway if it is worth it.

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