[Maintenance] Move twobyte_t into its own header file

And hope that there won't be any more generic utility types like it…

Part of P0133, funded by [Anonymous].

ReC98.h

@@ -53,12 +53,4 @@
 #define RES_PARASIZE ((sizeof(resident_t) + 0xF) >> 4)
 // ------
 
-typedef union {
-	struct {
-		int8_t lo, hi;
-	} byte;
-	uint8_t u[2];
-	int16_t v;
-} twobyte_t;
-
 #endif /* REC98_H */

ReC98.inc

@@ -29,6 +29,7 @@ include libs/master.lib/pf.inc
 include libs/master.lib/clip.inc
 include libs/master.lib/macros.inc
 include libs/kaja/kaja.inc
+include twobyte.inc
 include pc98.inc
 include th01/hardware/egc.inc
 include th02/formats/pi_slots.inc
@@ -47,11 +48,6 @@ setfarfp macro farfp, func
 	mov word ptr farfp, offset func
 endm
 
-twobyte_t struc
-	lo	db ?
-	hi	db ?
-twobyte_t ends
-
 ; master.lib extensions
 ; ---------------------
 ; super_roll_put_1plane() plane_put constants

th01/fuuin_02.cpp

@@ -10,6 +10,7 @@ extern "C" {
 #include <stdio.h>
 #include "ReC98.h"
 #include "pc98kbd.h"
+#include "twobyte.h"
 #include "th01/ranks.h"
 #include "th01/hardware/graph.h"
 #include "th01/hardware/input.hpp"

th01/main/boss/entity_a.cpp

@@ -1,4 +1,9 @@
-#include "ReC98.h"
+#include <stdlib.h>
+#include "platform.h"
+#include "pc98.h"
+#include "planar.h"
+#include "master.hpp"
+#include "twobyte.h"
 #include "th01/math/area.hpp"
 #include "th01/math/wave.hpp"
 #include "th01/hardware/egc.h"

th01/main_19.cpp

@@ -9,6 +9,7 @@ extern "C" {
 #include <io.h>
 #include <stdio.h>
 #include "ReC98.h"
+#include "twobyte.h"
 #include "th01/ranks.h"
 #include "th01/formats/grp.h"
 #include "th01/hardware/palette.h"

th04/end/box.cpp

@@ -1,5 +1,10 @@
-#include "ReC98.h"
+#include <dos.h>
+#include "platform.h"
+#include "pc98.h"
+#include "planar.h"
 #include "decomp.h"
+#include "twobyte.h"
+#include "master.hpp"
 
 // Note that this does not correspond to the tiled area painted into TH05's
 // EDBK?.PI images.

twobyte.h

@@ -0,0 +1,9 @@
+// Used by various (dumb) pieces of code that require byte-wise access to
+// 16-bit values.
+typedef union {
+	struct {
+		int8_t lo, hi;
+	} byte;
+	uint8_t u[2];
+	int16_t v;
+} twobyte_t;

twobyte.inc

@@ -0,0 +1,4 @@
+twobyte_t struc
+	lo	db ?
+	hi	db ?
+twobyte_t ends