Add 'CharUtil' and 'StringUtil' objects
Remove 'StringUtil'
Add test for 'CharUtil'
Modify the definitions of 'newline' and 'tab'
Add length restriction in 'oneOf' and 'noneOf'
Modify definitions using 'CharUtil'
Add new character parsers

‘alphaNum’, ‘letter’, ‘digit’, ‘hexDigit’ and ‘octDigit’