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.
Oh, so the high score name is only stored backwards for aesthetic
reasons, to make both the name and score blitting loops look identical.
Part of P0173, funded by [Anonymous].
nmlgc