- XMLUI now use objects with 2 main classes: widgets (button, label, etc), and container which contain widgets according to a layout
- widgets and containers classes are found through introspection, thereby it's really easy to add a new one
- there is still the AddWidgetName helper, for example AddText('jid', 'test@example.net') will add a StringWidget with name "jid" and default value "test@example.net"
- container can be inside other containers. changeContainer change the first parent container
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