RGBDS syntax updates (#905)

New MACRO and DEF syntax

data/events/engine_flags.asm

@@ -1,4 +1,4 @@
-engine_flag: MACRO
+MACRO engine_flag
 ; location, bit
 ; (all locations are in WRAM bank 1)
 	dwb \1 + (\2 / 8), 1 << (\2 % 8)

data/events/npc_trades.asm

@@ -1,4 +1,4 @@
-npctrade: MACRO
+MACRO npctrade
 ; dialog set, requested mon, offered mon, nickname, dvs, item, OT ID, OT name, gender requested
 	db \1, \2, \3, \4, \5, \6, \7
 	dw \8

data/events/odd_eggs.asm

@@ -1,14 +1,14 @@
-NUM_ODD_EGGS EQU 14
+DEF NUM_ODD_EGGS EQU 14
 
-prob: MACRO
-prob_total += \1
+MACRO prob
+	DEF prob_total += \1
 	dw prob_total * $ffff / 100
 ENDM
 
 OddEggProbabilities:
 ; entries correspond to OddEggs (below)
 	table_width 2, OddEggProbabilities
-prob_total = 0
+DEF prob_total = 0
 ; Pichu
 	prob 8
 	prob 1

data/events/pokedex_ratings.asm

@@ -1,4 +1,4 @@
-rating: MACRO
+MACRO rating
 ; count, sfx, text
 	db \1
 	dw \2, \3

data/events/special_pointers.asm

@@ -1,7 +1,7 @@
 ; Special routines can be used with the "special" map script command.
 ; They often use wScriptVar for arguments and return values.
 
-add_special: MACRO
+MACRO add_special
 \1Special::
 	dba \1
 ENDM

data/events/unown_walls.asm

@@ -1,18 +1,18 @@
-unownwall: MACRO
-for n, CHARLEN(\1)
-x = CHARSUB(\1, n + 1)
-if x == "-"
-	db $64
-elif x >= "Y"
-	db 2 * (x - "Y") + $60
-elif x >= "Q"
-	db 2 * (x - "Q") + $40
-elif x >= "I"
-	db 2 * (x - "I") + $20
-else
-	db 2 * (x - "A")
-endc
-endr
+MACRO unownwall
+	for n, CHARLEN(\1)
+		DEF x = CHARSUB(\1, n + 1)
+		if x == "-"
+			db $64
+		elif x >= "Y"
+			db 2 * (x - "Y") + $60
+		elif x >= "Q"
+			db 2 * (x - "Q") + $40
+		elif x >= "I"
+			db 2 * (x - "I") + $20
+		else
+			db 2 * (x - "A")
+		endc
+	endr
 	db -1 ; end
 ENDM