feature[ats_ATS144350]: In Support of Action - Add XFilteredTree

Change-Id: Ic63c435c469bba548154ed29eddce23cf12d38cc
refinement: Improve error handling when StateMgr null

Change-Id: I74310418626649e57eb63e439af431a266cc4791
refinement: HTMLize attribute values in ActionPage

Change-Id: I47520a9f7badb42256ae048eeb2aef2945f15cf3