Instrument dlg and wizard: add a combo box to staves to select the staff type

A combo box to select the staff type is added to the staff tree items of the New Score Instrument Wizard and of the "Create | Instruments..." dlg box.

In the wizard, the combo box lists all the available presets;
In the Instr. dlg, it lists the staff types available in the score and the presets.

If the staff group is changed, staff clef(s) are updated.

Also replaces the "Linked" text field in linked staves with a check mark.