Since 072ca960f5 changed the default
of the styles example back to Norwegian Wood, it is no longer
suited as gallery example.
Extract the dialog from it and re-add it as a gallery example Add a
tooltip displaying the class name and a help shortcut opening the
documentation.
Restructure the group boxes to add more widgets.
Remove the gallery meta-tag from the styles example.
Task-number: PYSIDE-1112
Change-Id: Ie6f13084012771bd8f5bf9cad23b58d0720fdd92
Reviewed-by: Cristian Maureira-Fredes <cristian.maureira-fredes@qt.io>
