Support CharSequence Sanitisation

[dansiviter]

So other JSON parsing libraries can be used support sanitisation of both whole JSON and individual values via java.lang.CharSequence.

Examples:

javax.json.JsonString node = ...
CharSequence sanitised = JsonSanitizer.sanitiseValue(node.getChars());

For situations such as a StringBuilder or StringBuffer it could also have the option to not create a new instance and edit in place to avoid GC churn related to String creation.