Changes:

• Change the behaviour of defaultPolicy to inherit the settings of a previous policy even if it does not inherit DefaultXmlSerializationPolicy. In rare cases this changes the behaviour (where a custom policy was originally set (with different defaults), it didn't inherit the default policy, and it is now replaced by a default policy).
• In XmlWriter introduce a safeCdsect function that will handle embedded end of cdata sequences by splitting the CDATA section into two sections. This is now used in serialization to avoid serialization errors if the value contains ]]>.

Fixes:

• Fix serialization of cdata in the generic (and Android) xml writer. The writer incorrectly escaped entities in cdata (#304), and did not correctly deal with ]]> in the cdata content (this is resolved by writing as two separate cdata sections).
• Make the default instance encodeToString (XML.encodeToString) use the regular behaviour for handling null prefixes. This fixes the default empty prefix being used if none is manually set (rather than the annotated prefix).
• Fix attributes not being prefixed with a namespace if their namespace prefix is the default prefix for that namespace. As a workaround leave the prefix different from its containers.
• In pedantic mode, allow an XmlSerialName to use the xml prefix as long as its namespace is left default or maps to the xml namespace. Also force the prefix used to be the standard prefix (although, depending on the xml writer this may already be the case effectively).
• For the generic parser / serializer make handling of newline/tabs in attribute values standard compliant (#300). This means that when writing all will be written as character entities to allow for preservation of the values. For reading the entities are just resolved. Actual newline/tab content in attribute values is normalized as space characters (where CRLF is still replaced by a single space). As attribute values can be differen types than CData this does not further normalize the value by collapsing whitespace sequences.