Use map type constants in map headers

include/constants/map_types.h

@@ -0,0 +1,25 @@
+#ifndef GUARD_CONSTANTS_MAP_TYPES_H
+#define GUARD_CONSTANTS_MAP_TYPES_H
+
+#define MAP_TYPE_0           0
+#define MAP_TYPE_TOWN        1
+#define MAP_TYPE_CITY        2
+#define MAP_TYPE_ROUTE       3
+#define MAP_TYPE_UNDERGROUND 4
+#define MAP_TYPE_UNDERWATER  5
+#define MAP_TYPE_6           6
+#define MAP_TYPE_7           7
+#define MAP_TYPE_INDOOR      8
+#define MAP_TYPE_SECRET_BASE 9
+
+#define MAP_BATTLE_SCENE_NORMAL       0
+#define MAP_BATTLE_SCENE_GYM          1
+#define MAP_BATTLE_SCENE_MAGMA        2
+#define MAP_BATTLE_SCENE_AQUA         3
+#define MAP_BATTLE_SCENE_SIDNEY       4
+#define MAP_BATTLE_SCENE_PHOEBE       5
+#define MAP_BATTLE_SCENE_GLACIA       6
+#define MAP_BATTLE_SCENE_DRAKE        7
+#define MAP_BATTLE_SCENE_FRONTIER     8
+
+#endif  // GUARD_CONSTANTS_MAP_TYPES_H