RGBDS syntax updates (#905)

New MACRO and DEF syntax

engine/menus/intro_menu.asm

@@ -967,7 +967,7 @@ Intro_PlacePlayerSprite:
 	const TITLESCREENOPTION_RESTART
 	const TITLESCREENOPTION_UNUSED
 	const TITLESCREENOPTION_RESET_CLOCK
-NUM_TITLESCREENOPTIONS EQU const_value
+DEF NUM_TITLESCREENOPTIONS EQU const_value
 
 IntroSequence:
 	callfar SplashScreen
@@ -1302,15 +1302,15 @@ UpdateTitleTrailSprite: ; unreferenced
 	ret
 
 .TitleTrailCoords:
-trail_coords: MACRO
-rept _NARG / 2
-_dx = 4
-if \1 == 0 && \2 == 0
-_dx = 0
-endc
-	dbpixel \1, \2, _dx, 0
-	shift 2
-endr
+MACRO trail_coords
+	rept _NARG / 2
+		DEF _dx = 4
+		if \1 == 0 && \2 == 0
+			DEF _dx = 0
+		endc
+		dbpixel \1, \2, _dx, 0
+		shift 2
+	endr
 ENDM
 	; frame 0 y, x; frame 1 y, x
 	trail_coords 11, 10,  0,  0

engine/menus/naming_screen.asm

@@ -1,8 +1,8 @@
-NAMINGSCREEN_CURSOR     EQU $7e
+DEF NAMINGSCREEN_CURSOR     EQU $7e
 
-NAMINGSCREEN_BORDER     EQU "■" ; $60
-NAMINGSCREEN_MIDDLELINE EQU "→" ; $eb
-NAMINGSCREEN_UNDERLINE  EQU "<DOT>" ; $f2
+DEF NAMINGSCREEN_BORDER     EQU "■" ; $60
+DEF NAMINGSCREEN_MIDDLELINE EQU "→" ; $eb
+DEF NAMINGSCREEN_UNDERLINE  EQU "<DOT>" ; $f2
 
 _NamingScreen:
 	call DisableSpriteUpdates

engine/menus/options_menu.asm

@@ -8,7 +8,7 @@
 	const OPT_MENU_ACCOUNT ; 5
 	const OPT_FRAME        ; 6
 	const OPT_CANCEL       ; 7
-NUM_OPTIONS EQU const_value    ; 8
+DEF NUM_OPTIONS EQU const_value    ; 8
 
 _Option:
 	ld hl, hInMenu

engine/menus/save.asm

@@ -1068,7 +1068,7 @@ EraseBoxes:
 	jr nz, .next
 	ret
 
-box_address: MACRO
+MACRO box_address
 	assert BANK(\1) == BANK(\2)
 	db BANK(\1)
 	dw \1, \2