Merge: Inline binops

This PR re-introduces several binary operations implemented as intern to avoid indirection through FFI in some specific cases to improve performance notably in `core/text/native`

Also a style change for `abs` which could easily be inlined and burned by eyes when I saw it, I can remove the commit if someone objects to the modification

Pull-Request: #1881
Reviewed-by: Jean Privat <jean@pryen.org>
Reviewed-by: Alexis Laferrière <alexis.laf@xymus.net>