* [ base ] Deprecate setByte in favour of setBits8
Deprecate getByte; fix Core.Binary.Prims
Along with `setByte`, the `getByte` function should similarly be
deprecated since it also assumes the value will have the given size,
rather than guaranteeing it in the type.
CI highlighted some required changes in `Core.Binary.Prims` thanks to
`-Werror`. The fix was to add some `cast` calls where the old `getByte`
and `setByte` used to be.
The RefC buffer test will need updating once we remove the functions
completely. Added a note for future peeps.
Including appropriate casts, and Num/Eq/Ord/Show implementations.
Also includes new primitives in Data.Buffer, and calls to foreign
functions in C as 'unsigned'.
