Add Button Proporties to NbWindowConfig

[timonmasberg]

Issue type

I'm submitting a ...

• bug report
• feature request

Issue description

It would be nice to have properties like minimizeButton in NbWindowConfig to control NbWindow behavior. Currently, there is no way doing that with the NbWindowService

Related code:

Example

 this.windowService.open(YourComponent, {
            title: 'I can not be minimized',
           minimizeButton: false
        });