* Don't Init DualScreenService on non duo device
* - add api check for get spanning rects
* - add additional api check
* - fix sample to be less confusing
* TPV fixes and added CG demos
* - simplify two page sample
* - fixes
* - uwp screen size fixes
* - performance updates
* - android alive check
* - code cleanup and more samples
* - additional gallery updates
* - add one shot hinge angle to android head
* - add text
* - dispose of hinge changes
* - unit test compile fix
* - split hinge angle into separate file
* Fixes TPV so it works anywhere on the screen
- add constructor for DualScreenInfo so users can apply it to whatever layout
* - fix layout checks
* - fixes
* - updates
* - no more invoke
Shane Neuville