Sync event.inc and scrcmd.c

include/constants/maps.h

@@ -12,4 +12,8 @@
 
 #define MAP(map) MAP_GROUP(map), MAP_NUM(map)
 
+// Used to indicate an invalid warp id, for dummy warps or when a warp should
+// use the given coordinates rather than the coordinates of a target warp.
+#define WARP_ID_NONE (-1)
+
 #endif  // GUARD_CONSTANTS_MAPS_H