Encode String not behaving well with special characters.

[ghost]

In encodeString() chars are checked using

if(ch.unicode() >= 32 && ch.unicode() < 128) 

If they are not within this range, some specific treatment for special characters with a switch/case are made.
Problems is that some of those special characters are within the first checked range, and so they don't get treated correctly.

Problem exists for ", / and \

Encoding following String "Hello "Mister" " will encode to "Hello "Mister" " instead of "Hello "Mister" "

Attached a suggested implementation.

Thanks again for the very usefull lib!!

qjson.zip