RGBDS syntax updates (#905)

New MACRO and DEF syntax

engine/pokemon/bills_pc.asm

@@ -1370,7 +1370,7 @@ BillsPC_RefreshTextboxes:
 .Placeholder:
 	db "-----@"
 
-copy_box_data: MACRO
+MACRO copy_box_data
 .loop\@
 	ld a, [hl]
 	cp -1
@@ -1394,9 +1394,9 @@ copy_box_data: MACRO
 	jr .loop\@
 
 .done\@
-if \1
-	call CloseSRAM
-endc
+	if \1
+		call CloseSRAM
+	endc
 	ld a, -1
 	ld [de], a
 	ld a, [wBillsPCTempBoxCount]

engine/pokemon/breeding.asm

@@ -835,7 +835,7 @@ Hatch_InitShellFragments:
 	call EggHatch_DoAnimFrame
 	ret
 
-shell_fragment: MACRO
+MACRO shell_fragment
 ; y tile, y pxl, x tile, x pxl, frameset offset, ???
 	db (\1 * 8) % $100 + \2, (\3 * 8) % $100 + \4, \5 - SPRITE_ANIM_FRAMESET_EGG_HATCH_1, \6
 ENDM

engine/pokemon/mail_2.asm

@@ -11,7 +11,7 @@
 	const BLUESKY_MAIL_INDEX ; 7
 	const MUSIC_MAIL_INDEX   ; 8
 	const MIRAGE_MAIL_INDEX  ; 9
-NUM_MAIL EQU const_value
+DEF NUM_MAIL EQU const_value
 
 ReadPartyMonMail:
 	ld a, [wCurPartyMon]

engine/pokemon/move_mon.asm

@@ -1,4 +1,4 @@
-RANDY_OT_ID EQU 01001
+DEF RANDY_OT_ID EQU 01001
 
 TryAddMonToParty:
 ; Check if to copy wild mon or generate a new one

engine/pokemon/stats_screen.asm

@@ -2,9 +2,9 @@
 	const PINK_PAGE  ; 1
 	const GREEN_PAGE ; 2
 	const BLUE_PAGE  ; 3
-NUM_STAT_PAGES EQU const_value - 1
+DEF NUM_STAT_PAGES EQU const_value - 1
 
-STAT_PAGE_MASK EQU %00000011
+DEF STAT_PAGE_MASK EQU %00000011
 
 BattleStatsScreenInit:
 	ld a, [wLinkMode]