private void makeSimpleEscape(char source, char dest) {
            needEscape[source] = 1;
            replacement1[source] = '\\';
            replacement2[source] = (byte) dest;
        }
Escapes strings into and out of a format where they only contain printable characters.

Need to duplicate escape / unescape of strings as we have in C++ for java version of system states.

@author Haakon Humberset
config-lib/src/main/java/com/yahoo/config/text/StringUtilities.java