QmlDesigner: Remove dragIcon from ItemLibrary

Was not used any more.

Change-Id: I6fbe2e5224cfcf7f6250684f7653b34f3247220a
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>
QmlDesigner: Move default icon path in getter

Change-Id: I752d6694a6a13fe7001675e67b3b7773f142675b
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>
QmlDesigner: Fix icon names for ItemLibraryEntry

icon and iconPath are two different icons.

Change-Id: I62ab07a13240bc23bc9d807dbd46742ce7d71300
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>
QmlDesigner: Use library entry icon for DnD in item library

Change-Id: Ie8a55c352eddcfec3591e2174373bed524a81dac
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>
QmlDesigner: Remove unused ItemLibraryModel::createDragPixmap

Change-Id: I1a8838969a5b5bd4917ee35afbbde0348737660c
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>