examples: update hello world example Our helloworld example thatw e reference from the manual has been a bit complicated to serve a first contact with gstreamer. Since we have and promote playbin2 as a playback api use it here. Based on work from Mathias Hasselmann <mathias.hasselmann@gmx.de> Fixes #424143
tests: clean up eventloop in examples Don't leak the bus. Don't parse messages with the method for errors (triggers gobject warning).
gstxml: Deprecate GstXml and related functions Pipeline serialisation to and from XML is horribly broken for all but the most simple use cases, and will likely never be fixed. Make sure everyone playing around with these tools is aware of this, to avoid frustration. See countless bug reports in bugzilla. Fixes bug #622685.