QmlDesigner.PropertyEditor: adding color constants

Change-Id: Iced7b432da397485015a4ea4a3e742f0ab475b6a
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>
QmlDesigner.PropertyEditor: adding functionality to ComboBox

* Adding the ExtendedFunctionButton
* Adding blue highlight for modified values

Change-Id: I2035ebba61b27ec5c75f02abc3a435709cc69f43
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>
QmlDesigner.PropertyEditor: adding functionality to LineEdit

* Adding the ExtendedFunctionButton
* Adding blue highlight for modified values

Change-Id: I44f7d3bfbf58f0fe60321b5c696d3e3ba9c6578f
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>
QmlDesigner.PropertyEditor: adding functionality to SpinBox

* Adding blue highlight for modified values

Change-Id: I8d68dc2e23a7c1c3d2055a5be13d7f57e94860ed
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>
QmlDesigner.PropertyEditor: adjusting combobox sizes

Using Layout.fillWidth: true.

Task-Number: QTCREATORBUG-10413
Change-Id: Ia2771fa6e8a4cbb3acc3c2893fccbcb23fa78f6f
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>