Handle optional arguments for warp commands, add WARP_ID_NONE

src/pokedex_area_screen.c

@@ -16,7 +16,6 @@
 #include "trig.h"
 #include "pokedex_area_region_map.h"
 #include "wild_encounter.h"
-#include "constants/maps.h"
 #include "constants/region_map_sections.h"
 #include "constants/rgb.h"
 #include "constants/songs.h"