Add support for XEP-0198: Stream Management

- 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

resources/getCopyright.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+SCRIPTDIR="$(dirname ${BASH_SOURCE[0]})"
+BASEDIR=${SCRIPTDIR}/..
+
+cd $BASEDIR
+SUBPROJECTS=$(grep -oP "\'.*\'" settings.gradle | sed "s;';;g")
+for p in $SUBPROJECTS; do
+	echo "Copyright notices for $p"
+	# Find all .java files in the project
+	find $p/src -type f -name "*.java" -print0 | \
+		# Get the project string
+		xargs -0 grep -ohP '^.*\* Copyright \K.*' | \
+		# Sort the output
+		sort | \
+		# Remove duplicates
+		uniq | \
+		# Split multi Copyright statemtents, e.g. "2001-2013 FooBar, 2014 Baz"
+	    tr ',' '\n' | \
+		# Remove whitespaces resulting from the previous split
+		sed "s/^[ \t]*//" | \
+		# Remove dots at the end and '©' at the beginning
+		sed "s/^© //" | sed "s/\.$//" | sed "s/^(C) //"
+	echo -ne "\n"
+done