Position plug-ins don't need QtGui

Task-number: QTBUG-36893
Change-Id: I54f71f3369e82edfadb679cb5ed27e3dd0a78c0e
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Normalize signal & slot signatures in connection

Profiling shows Qt Creator spends 2% of its load time normalizing

Change-Id: Ica52c45e34fe53823b31faaa7d77a633458549d5
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>