QmlDesigner: Remove itemLibId in ItemLibraryItem

Change-Id: I0b7fc69b405f59b5f20fb453556eab0a1881f9eb
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>
QmlDesigner: Remove ItemLibraryModel::m_itemInfos

Change-Id: Ie4d91fb6f433684d273317e1b2191474f70f156b
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>
QmlDesigner: Change ItemLibrarySectionModel to list

Change-Id: I04932ff50e0e4f8a1eda72df35e9ba675ae2709e
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>
QmlDesigner: Fix default value of ItemLibraryItem::m_isVisible

Change-Id: I5228af65756e457bb08719599354f10f9cf772cd
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>
QmlDesigner: Remove ItemLibraryModel::m_sections

Change-Id: I884af24b8e36a81a7f11b2587d84f7f33ff948c3
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>
QmlDesigner: Remove sectionVisibilityChanged

Change-Id: I5d9840fcfa5be4ea783cfa3d412637c98bbb68c0
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>
QmlDesigner: Add visible to section

Change-Id: I7d4e3ef3fe843d28336c306afa6de0e3450eb733
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>
QmlDesigner: Add visible property to ItemLibraryItem

Change-Id: I22cd7d587f030343cbf71c62357b9752650e4711
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>
QmlDesigner: Always show all items in section model

Change-Id: Iad0ee5e39553c9cb778bfd5673378af84063f4af
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>