Tabs are getting a big upgrade

[israel-dryer]

The Notebook will continue to be supported as a built-in widget. However, because Notebook can be pretty limiting, I'm adding 2 new widgets to support more modern tab features: Tabs and TabView.

The Tabs widget is a dedicated tabbar that has 2 variants, bar and pill. These tabs support both horizontal and vertical orientation, can display icons, and also support a 'close' feature. This will allow you to create new tabs on demand, or delete then if you wish. You can enable this close button to show always or on 'hover'.

In addition, you can enable adding, which puts an '+' button in the tab bar for horizontal and '+ New' for vertical.

The TabView widget is basically a Tabs widget connected by signal to a PageStack, which is a new navigation widget available in v2 that enables easy multi-page navigation.