XML encoding: pom.xml, site.xml, ... 

Until now (Maven 2.0.7), XML encoding support is buggy:

• XML streams are read with platform encoding, which leads to problems with non-ascii characters on ascii based platforms, and every characters on non-ascii platforms (Z/OS with EBCDIC),
• XML streams are transformed to String (with platform encoding), and the resulting String is reworked a lot before being parsed by an XML parser (interpolation...)
• even if XML streams were directly passed to the XML parser, MXParser used by Maven does not support encoding itself...

Changing the parser, then the interpolation code is a big task. 

Solution: use XmlReader class from Rome to detect XML streams encoding as defined in XML specification

It won't change much things in the code: only the Reader instanciation. Every other code (particularly interpolation) can remain the same.

Jira issues:

• [PLXUTILS-11]: add XmlReader to plexus-utils
• [MNG-2254]: use XmlReader to read pom.xml
• [MSITE-239]: use XmlReader to read site.xml
• [PLX-343]: use XmlReader in plexus-container-default to load XML configuration files
• [MANTTASKS-14]: make Maven Ant Tasks work on Z/OS
• TODO : use XmlReader class wherever an XML stream has to be changed into a String/Reader
• TODO: integrate it to Modello