Valgrind: Remove unused ValgrindBaseSettings::displayName

Change-Id: Id1f03290b428a9ef6450df6f428cf8fd493c7453
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
ProjectExplorer: Streamline ToolchainFactory interface

Change-Id: I70dba496c4d1eeb9c6767080d179f86f20c1b107
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
QmlDesigner: Raise exception for a invalid parent property

Change-Id: I0272b0aefc0598ad524aa1d9e6b434ef2dcd79a9
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>