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.
The main effect behind the discoloration seen in the bomb animation,
as well as the exploding squares at the end of Kikuri's and Sariel's
entrance animation.
Single-function segments are lovely, by the way!
Part of P0121, funded by Yanga.
nmlgc