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.
Exactly 4 years and 1 month after 881f2c6, TH02 finally received the
dedicated attention for this feature. But Why are the options rendered
with PAT_OPTION_A all the time? 🤔
Part of P0259, funded by Splashman and Yanga.
nmlgc