Use def_* macros for automatic map event counts

Resolves #742

macros/legacy.asm

@@ -223,18 +223,12 @@ signpost: MACRO
 ENDM
 
 person_event: MACRO
-;	object_event \3, \2, \1, \4, \5, \6, \7, \8, \9, \10, \11, \12, \13
-	db \1, \2 + 4, \3 + 4, \4
-	dn \6, \5
-	db \7, \8
-	shift
-	dn \8, \9
-	shift
-	db \9
-	shift
-	dw \9
-	shift
-	dw \9
+_s = \1
+_y = \2
+_x = \3
+_m = \4
+	shift 4
+	object_event _x, _y, _s, _m, \1, \2, \3, \4, \5, \6, \7, \8, \9
 ENDM
 
 PERSONTYPE_SCRIPT   EQUS "OBJECTTYPE_SCRIPT"

macros/scripts/maps.asm

@@ -5,16 +5,45 @@ ENDM
 
 object_const_def EQUS "const_def 2"
 
+def_scene_scripts: MACRO
+if DEF(_NUM_SCENE_SCRIPTS)
+	PURGE _NUM_SCENE_SCRIPTS
+endc
+_NUM_SCENE_SCRIPTS EQUS "_NUM_SCENE_SCRIPTS_\@"
+	db _NUM_SCENE_SCRIPTS
+_NUM_SCENE_SCRIPTS = 0
+ENDM
+
 scene_script: MACRO
 ;\1: script pointer
 	dw \1
 	dw 0 ; filler
+_NUM_SCENE_SCRIPTS = _NUM_SCENE_SCRIPTS + 1
+ENDM
+
+def_callbacks: MACRO
+if DEF(_NUM_CALLBACKS)
+	PURGE _NUM_CALLBACKS
+endc
+_NUM_CALLBACKS EQUS "_NUM_CALLBACKS_\@"
+	db _NUM_CALLBACKS
+_NUM_CALLBACKS = 0
 ENDM
 
 callback: MACRO
 ;\1: type: a MAPCALLBACK_* constant
 ;\2: script pointer
 	dbw \1, \2
+_NUM_CALLBACKS = _NUM_CALLBACKS + 1
+ENDM
+
+def_warp_events: MACRO
+if DEF(_NUM_WARP_EVENTS)
+	PURGE _NUM_WARP_EVENTS
+endc
+_NUM_WARP_EVENTS EQUS "_NUM_WARP_EVENTS_\@"
+	db _NUM_WARP_EVENTS
+_NUM_WARP_EVENTS = 0
 ENDM
 
 warp_event: MACRO
@@ -24,6 +53,16 @@ warp_event: MACRO
 ;\4: warp destination: starts at 1
 	db \2, \1, \4
 	map_id \3
+_NUM_WARP_EVENTS = _NUM_WARP_EVENTS + 1
+ENDM
+
+def_coord_events: MACRO
+if DEF(_NUM_COORD_EVENTS)
+	PURGE _NUM_COORD_EVENTS
+endc
+_NUM_COORD_EVENTS EQUS "_NUM_COORD_EVENTS_\@"
+	db _NUM_COORD_EVENTS
+_NUM_COORD_EVENTS = 0
 ENDM
 
 coord_event: MACRO
@@ -35,6 +74,16 @@ coord_event: MACRO
 	db 0 ; filler
 	dw \4
 	dw 0 ; filler
+_NUM_COORD_EVENTS = _NUM_COORD_EVENTS + 1
+ENDM
+
+def_bg_events: MACRO
+if DEF(_NUM_BG_EVENTS)
+	PURGE _NUM_BG_EVENTS
+endc
+_NUM_BG_EVENTS EQUS "_NUM_BG_EVENTS_\@"
+	db _NUM_BG_EVENTS
+_NUM_BG_EVENTS = 0
 ENDM
 
 bg_event: MACRO
@@ -44,6 +93,16 @@ bg_event: MACRO
 ;\4: script pointer
 	db \2, \1, \3
 	dw \4
+_NUM_BG_EVENTS = _NUM_BG_EVENTS + 1
+ENDM
+
+def_object_events: MACRO
+if DEF(_NUM_OBJECT_EVENTS)
+	PURGE _NUM_OBJECT_EVENTS
+endc
+_NUM_OBJECT_EVENTS EQUS "_NUM_OBJECT_EVENTS_\@"
+	db _NUM_OBJECT_EVENTS
+_NUM_OBJECT_EVENTS = 0
 ENDM
 
 object_event: MACRO
@@ -74,6 +133,7 @@ object_event: MACRO
 	dw \9
 	shift
 	dw \9
+_NUM_OBJECT_EVENTS = _NUM_OBJECT_EVENTS + 1
 ENDM
 
 trainer: MACRO