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.
I might change this convention again in the future, particularly once
someone wants to fund C89 conformance, but let's stay consistent for
now.
Part of P0264, funded by [Anonymous] and Blue Bolt.
The asymmetry of having to do this for TH05's resident structure but
not for TH04's has finally become annoying enough.
Part of P0263, funded by [Anonymous].
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].
And no longer force translation units that access the resident
structure into #including that mistake that was ReC98.h.
Part of P0124, funded by [Anonymous] and Blue Bolt.
The TH04 one might have the same function structure, but the only thing
that's actually identical in both games is the picture darkening loop.
Part of P0119, funded by [Anonymous] and -Tom-.
nmlgc