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.
Moving the code from TH01 to a new platform layer, and deciding against
the `pc98_` prefix, which is sort of implied by the directory of the
header file it came from. Namespaces would be ideal, but Turbo C++ 4.0J
sadly doesn't support them.
Part of P0232, funded by [Anonymous].
nmlgc