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.
Featuring a return of the recently developed `$ -` tech, along with
some unfortunate PI breaks… But hey, at least it makes sense to start
out with this move!
Part of P0264, funded by [Anonymous] and Blue Bolt.
nmlgc