RGBDS syntax updates (#905)

New MACRO and DEF syntax

macros/scripts/gfx_anims.asm

@@ -1,37 +1,37 @@
 ; pic + oam animations
 
-frame: MACRO
+MACRO frame
 	db \1
-x = \2
-if _NARG > 2
-rept _NARG - 2
-x |= 1 << (\3 + 1)
-	shift
-endr
-endc
+	DEF x = \2
+	if _NARG > 2
+		rept _NARG - 2
+			DEF x |= 1 << (\3 + 1)
+			shift
+		endr
+	endc
 	db x
 ENDM
 
 	const_def -1, -1
 
 	const endanim_command ; $ff
-endanim: MACRO
+MACRO endanim
 	db endanim_command
 ENDM
 
 	const dorestart_command ; $fe
-dorestart: MACRO
+MACRO dorestart
 	db dorestart_command
 ENDM
 
 	const dowait_command ; $fd
-dowait: MACRO
+MACRO dowait
 	db dowait_command
 	db \1 ; frames
 ENDM
 
 	const delanim_command ; $fc
-delanim: MACRO
+MACRO delanim
 ; Removes the object from the screen, as opposed to `endanim` which just stops all motion
 	db delanim_command
 ENDM
@@ -41,13 +41,13 @@ ENDM
 	const_def -2, -1
 
 	const setrepeat_command ; $fe
-setrepeat: MACRO
+MACRO setrepeat
 	db setrepeat_command
 	db \1 ; amount of times to repeat
 ENDM
 
 	const dorepeat_command ; $fd
-dorepeat: MACRO
+MACRO dorepeat
 	db dorepeat_command
 	db \1 ; command offset to jump to
 ENDM