Modify "GetNextElement" to split VMZoneSimple to VMSplitZone
GetUpParent > use the correct parent
Merge branch 'develop' into f-splitscrolling-onfly

Conflicts:
	Plugins/Accessibility/KeyScroller/KeyScroller.cs
This update change the scrolling flow : VMZoneSimple > VMSplitZone > VMKeySimple
Up to parent don't go at first element / it continues his way
Continue to the first Split Scrolling
Fix _current IndexOutOfRangeException
Merge branch 'develop-2013' into f-splitscrolling-onfly
Add some comments
Change constant's naming
Merge branch 'f-splitscrolling-onfly' into develop-2013

Conflicts:
	Plugins/Accessibility/KeyScroller/KeyScroller.csproj