Move the string vars to string_util

src/string_util.c

@@ -2,6 +2,10 @@
 #include "string_util.h"
 #include "text.h"
 
+EWRAM_DATA u8 gStringVar1[32] = {};
+EWRAM_DATA u8 gStringVar2[20] = {};
+EWRAM_DATA u8 gStringVar3[20] = {};
+EWRAM_DATA u8 gStringVar4[1000] = {};
 EWRAM_DATA u8 gUnknownStringVar[16] = {0};
 
 static const u8 sDigits[] = __("0123456789ABCDEF");