* Init
* Remove XY navigation cache as it's no use
* Use pooled collection for XY navigation
* Restructure code a bit, fix IScroller handling
* Init KeyboardNavigationTests_XY tests
* Simplify XYFocus.GetNextFocusableElement usage
* Minor fixes
* Add more tests
* Remove unused NuiKeyboardNavigationHandler
* Finalizing
* Fix tests
* Add TODO12
* Make XYFocusOptions a class
* Add TestServices.FocusableWindow and make KeyboardNavigationHandler lazy, as it can't be reused on multiple windows
* Fix KeyboardNavigationHandler events handling, when focus was not actually changed
* Add arrow key tests
* Replace XYFocusKeyboardNavigationMode with more flexible XYFocusNavigationModes, integrate with KeyDeviceType input types
* Make XY focus navigation less broken, when there is no starting focused control
* Several Android TV compatibility improvements
* Remap tizen Back button to Esc
* Introduce internal XYFocusHelpers
* Make ComboBox and AutoCompleteBox handle Key events only when it's needed
* Make TextBox handle Key events only when it's needed
* Ignore Alt+Down when XY navigation is enabled in CalendarDatePicker and SplitButton
* Rename IsAllowedXYNavigationMode
* Fix ButtonSpinner with XY navigation
* Implement a very simple focus engagement for GridSplitter and Slider