- De-duplicate code by moving it into AbstractXMPPConnection
- Introduce TopLevelStreamElement as superclass for all XMPP stream elements.
- Add SynchronizationPoint, ParserUtils
- Add ParserUtils
Fixes SMACK-333 and SMACK-521
Re-work filetransfer/bytestream stanza toXML() method to use
XmlStringBuilder. Move the ELEMENT and NAMESPACE definitions in the
right place, ie. the stanza class.