Added a 3-switch emulation on touch interface and implemented a control in TeclaAccessibilityService show interaction of shield navigation with highlighter.
Implemented scanning.  Working on scroll.
Control overlay shows D-Pad with center key.
Implemented a method to find the clickable node that is closest to a specified point.
Modified algorithm to find the closest item on the display at a specified direction.
Modified the algorithm to take care of edge cases.
Implemented active navigation.  Click action does not properly function yet.
Click action now works properly.
Update nodes on TYPE_WINDOW_CONTENT_CHANGE.
Fixed null pointer exception.
Red highlight on the parent node.
Highlight tweaks for better usability
Merge branch 'fixes' of github.com:jorgesilva/tecla-as into develop

Highlighting fixes for demo + rough UI for node control
Conflicts:
	src/ca/idrc/tecla/TeclaAccessibilityOverlay.java
	src/ca/idrc/tecla/TeclaAccessibilityService.java