Let's see if anyone ever tries to compile this codebase with a pre-C89
compiler that enforces the # at the beginning of the line.
Part of P0203, funded by [Anonymous] and GhostRiderCog.
Less fancy token pasting, replacing them with inline functions where
possible, entirely removing unnecessary ones, and fixing smaller
issues here and there.
Part of P0186, funded by [Anonymous] and Blue Bolt.
Getting us completely macro-free there… even though it did require a
separate version of those functions if the ID is a pointer.
Part of P0134, funded by [Anonymous].