With the upcoming `#include` cleanup, it finally makes sense to split
off all graphics-related code into its own header. In turn, it makes
more sense to store all of these future master.lib headers in, well,
the master.lib directory, which provides a new 8 characters for their
file names. Turns out that the rationale I gave for the root directory
placement in 8266bbd didn't hold up 3½ years later…
(Also, the `pc98.h` declarations will eventually be split into
`game/coords.hpp` and something in `platform/x86real/pc98/`.)
Part of P0284, funded by [Anonymous] and Blue Bolt.
The translation units were probably a better place back when most of
the codebase was still compiled in C mode, we only had a few C++ TUs,
almost everything needed to be declared as `extern "C"`, and moving
these declarations into the headers would have been really noisy with
all the `#ifdef __cplusplus` / `#endif` required. Nowadays though,
we've greatly reduced that surface area. And given that headers will
include even more headers as part of the upcoming `#include` cleanup,
it makes sense to make the jump now.
Part of P0284, funded by [Anonymous] and Blue Bolt.
Not only would the `(GAME != 2)` need to include TH03 in the future,
but this `#undef` trickery will blow up once we start reorganizing the
`#include`s in the next few commits.
Sadly, a few source files use master.lib's grcg_off() function in one
game and the macro in the other, which makes it infeasible to assign a
distinct name for every function.
Part of P0284, funded by [Anonymous] and Blue Bolt.
What a beautiful micro-optimization! What's less beautiful though is
the fact that the segment-3 version is only used by a single function,
where it could have easily been inlined.
Part of P0192, funded by [Anonymous], nrook, and -Tom-.
nmlgc