Test the RGBASM state file output (#1472)

test/asm/state-file/a.asm

@@ -0,0 +1,26 @@
+OPT Wno-unmapped-char
+
+DEF constant EQU 1
+DEF variable = 2
+DEF string EQUS "hello!"
+CHARMAP "c", 4
+MACRO polo
+	db 5
+ENDM
+
+def variable += 1
+
+def con2 equ -1
+def var2 = variable**2
+def str2 equs strcat("{string}", "\0\n\t\r")
+charmap "c2", 10, -11, 987654321
+
+PURGE polo
+MACRO mac2
+	!?@#;^&
+ENDM
+
+newcharmap map2, main
+charmap "\0\n\t\r", "\t", "\r", "\0", "\n"
+
+REDEF string EQUS "goodbye~"