Replace XPP3 by XmlPullParser interface wrapping StAX and XPP3
Introducing Smack's own XmlPullParser interface which tries to stay as
compatible as possible to XPP3. The interface is used to either wrap
StAX's XMLStreamReader if Smack is used on Java SE, and XPP3's
XmlPullParser if Smack is used on on Android.
XMPPTCPConnection: Move openStream() call from writer into reader thread
and also call notifyConnectionError() on exception thrown by
openStream().
In hindsight I wonder why openStream() was ever called in the writer
thread, as it only caused unnecessary synchronization overhead, as can
be seen by the initialOpenStreamSend synchronization point.
Florian Schmaus
Automatically assigned