[NUI] Add Tizen.NUI.LayoutSamples

[NUI] Add Tizen.NUI.LayoutSamples

Tizen.NUI.LayoutSamples is added to test Layout behavior.

Each class is designed based on LayoutSamplesClassDiagram.png.

Tizen.NUI.LayoutSamples is consist of Display Window and Control Window.

DisplayWindow.png shows Display Window.
ControlWindowLayoutTab.png and ControlWindowViewTab.png show Control
Window.

Display Window shows each object view on the screen.

Control Window sets each object view's layout properties and view
properties.

If user selects an object view on Display Window by clicking, its layout
properties and view properties appear on Control Window.

"Add View" button on Control Window adds a child object view to the
selected object view.
"Remove View" button on Control Window removes the selected object view.