Ability to add buttons to the delivery orders screen

In API V9Preview4, the ability to add buttons to the delivery orders screen appeared, through which plugins can display their own windows.

The AddButtonToDeliveriesScreen method was added with the following parameters:

• string caption — button title,
• bool isChecked — whether the button is selected,
• bool isEnabled — whether the button is available for clicking,
• Action<(IViewManager vm, (Guid , string , bool , string ) state)> callback — click handler for the button, in which it is possible to display dialog windows and make changes,
• iconGeometry — icon in Path Markup format (optional argument).

The button click handler accepts an instance of IViewManager for displaying windows, as well as the current state of the button - (Guid buttonId, string caption, bool isChecked, string iconGeometry) state.