Implement IntoElements on Into<Element> instead of Element
This allows libraries such as xmpp-parsers implementing From<Something> for Element or Into<Element> to automatically benefit from the ElementBuilder::append() method.
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Do not update/delete: Notification broadcast message test data
This allows libraries such as xmpp-parsers implementing From<Something> for Element or Into<Element> to automatically benefit from the ElementBuilder::append() method.