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.
Choosing C++ RAII wrappers because there's at least one case where ZUN
misplaced a manual grcg_off(). This implementation combines safety with
the optimal instructions for both dynamic and static use cases.
Part of P0232, funded by [Anonymous].