OK, this is the big one. We still keep using `#include` guards only
where we absolutely need to, but with each header now being valid in
isolation, this can now actually help *minimize* the length of each
translation unit's `#include` list. Turns out that after removing all
the duplicates, we only *actually* need to guard 29 headers across all
5 games.
Part of P0285, funded by [Anonymous] and iruleatgames.
We're soon going to encounter a case that uses a non-optional variant
of this type. It's less common, but still deserves the shorter name due
to being one addition less complex.
Part of P0261, funded by [Anonymous] and Yanga.
nmlgc