Implement PassiveScrollViewer; replace ScrollViewer in all XAML controls

[koal44]

Implement PassiveScrollViewer across various controls for improved mousewheel behavior

Pull request type

• Feature

Current Behavior

Currently, many controls in this library use a ScrollViewer, which, while configurable (CanContentScroll, etc) still consumes mousewheel events, leading to a less-than-optimal user experience Stackoverflow. This can be observed within the Gallery app by going to the 'NavigationView' section and attempting to mouse wheel down the page. While replacing .NET's control might seem heavy-handed the only current remedy for app devs is to copy the control and directly replace the style.

New Behavior

1. Open the Gallery app and go to the 'NavigationView' page
2. Use the mouse wheel to scroll through the controls down the center of the page (it's cheating if you mouse wheel over the scrollbar).
3. Optionally, toggle the IsScrollSpillEnabled default value new PropertyMetadata(true)); (PassiveScrollViewer.cs, line 21) and head over to the 'DataGrid' page to observe the difference.

Other information

[pomianowski]

Hey @koal44, thank you for your contributions to the WPF UI. It seems that event bubbling works perfectly and scroll correctly moves to higher controls.