QmlDesigner.Button: using Constants.js

Change-Id: I0715d9a377493ffb383edf9f28ec1725191e5efb
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>
QmlDesigenr.PropertyEditor: fixing styling of binding editor

Change-Id: Ia0ee9345a5cc1a8b5a9f9208306d91edb47ace35
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>
QmlDesigner.PropertyEditor: style HueSlider

Change-Id: Iec7483006ca91482c7f9a6a81dc742294e78ad1f
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>
QmlDesigner.PropertyEditor: Adding GradientModel

Change-Id: Ifeb9aeb8515a91f57a0d532fb3c0e32650e4f403
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>
QmlDesigner.PropertyEditor: using GradientModel in QML

Change-Id: I939fe8952e12f20d4a4ca6d6a41ee578cee0f7b5
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>
QmlDesigner.Naviagor: crash fix for slides in model

For some reason gradient stops end up in the navigator model.
This should be fixed for 3.1.

Change-Id: Ic447a6907409e4e9776cfd164a49bb6194cc4cab
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>