LPS-39666 Add new updatePriority services (remote & local) to Layout that
receive "next" & "previous" layoutIds besides the layoutId
LPS-39666 Apply new method to UpdateLayoutAction#updatePriority when sorting is done through the navigation bar
LPS-39666 Update navigation.js#_saveSortables to send the new parameters
LPS-39666 Javadoc
LPS-39666 Autogenerated