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.
So if Sariel's version of this function is worse than Konngara's, can
we conclude that Sariel's code was written first?
(Edit, after having decompiled more of the fight: Sariel's functions
are predominantly `near` in contrast to Konngara's 100% `far` ones,
which is just as much of an indicator for the opposite.)
Part of P0174, funded by Ember2528.