LDEV-1280: Implementing assign groups to branch in monitor screen (for define later). Required adding new functionality to branch related objects and a new call in lesson that allows monitoring to check if the branching activity has been attempted (we don't let the user remove groups or users from a branch once the branching activity has been commenced). Also moved the
UTF-8 ajax fix to a common class in lams.jar so it can be used for all AJAX calls if desired.