Started to work on json utf8 stuff...
Simple test to check unicode escape sequence -> utf8 functionality.
Commented unicode escape sequence -> utf8 function a bit.
Some additional tests if unicode char escape sequence is valid.
Restructured convertUnicodeEscapeSequence method a bit.
Some more tests for unicode escape sequence replacer... don't work yet.
Extended utf8 tests a bit more.
Make convertUnicodeEscapeSequence convert only \uNNNN and \UNNNNNNNN.
Fixed one wrong utf8 stuff testcase.
Simplified checking if an escaped sequence is escaped.
Improved unicode escape sequence formatter, now also works with \U.
Using picojson library to parse text from sign line json.
Removed own, now unnecessary, utf-8 stuff.