partial fix for FString::IsInt()

src/common/utility/zstring.cpp

@@ -1089,6 +1089,12 @@ octdigits	= [0-7];
 
 ("0" octdigits+ | "0" [xX] hexdigits+ | (digits \ '0') digits*) { return true; }
 [\000-\377] { return false; }*/
+
+	//FIX for "0" returning false, doesn't fix 0 with whitespace, but that isn't necessary for savegame loading, so it'll need to be fixed later
+	if(Len() == 1 && Chars[0] == '0') return true;
+
+
+
 	const char *YYCURSOR = Chars;
 	char yych;