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.
Starting with the simple refresh rate-oblivious code from TH01, until
we've figured out what the rest of the master.lib code is doing and
have valid reasons to include it. Also extending the second counter to
32-bit because we *might* be measuring some processes that could take
longer than 19:35 minutes…
Part of P0232, funded by [Anonymous].
nmlgc