RGBDS syntax updates (#905)

New MACRO and DEF syntax

maps/GoldenrodDeptStore6F.asm

@@ -1,6 +1,6 @@
-GOLDENRODDEPTSTORE6F_FRESH_WATER_PRICE EQU 200
-GOLDENRODDEPTSTORE6F_SODA_POP_PRICE    EQU 300
-GOLDENRODDEPTSTORE6F_LEMONADE_PRICE    EQU 350
+DEF GOLDENRODDEPTSTORE6F_FRESH_WATER_PRICE EQU 200
+DEF GOLDENRODDEPTSTORE6F_SODA_POP_PRICE    EQU 300
+DEF GOLDENRODDEPTSTORE6F_LEMONADE_PRICE    EQU 350
 
 	object_const_def
 	const GOLDENRODDEPTSTORE6F_LASS