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.
Fixes SMACK-591.
Also introduce JUnit 5 and non-strict javadoc projects.
Type 'groupchat' message stanzas are not like others, they usually
require special handling. Hence such a filter is usually an indication
that multiple concepts are intermixed.
* Created filters to be used with incoming and outgoing message stanzas
* Added a list of ChatMarkersListener and its add and remove methods.
* Added a stanza listener for outgoing messages.
* Added a stanza listener for incoming messages.
* Added discover feature for XEP-0333.
* Added methods to inform a message was: received, displayed or ack
* Added javadoc autor tag.