Fronend panel structure module (UI) has been improved:
 - Create Structure js module;
 - Add tilla-ui.tree lib;
 - jQuery.NestedSortable lib replaced on tilla-ui.tree;
 - Perfomance $confirm method improved;
 - Improved call falseFunction method when closing the modal window $confirm;
 - Improved call the clear form functions when closing the modal window $createContent;
 - And other improvements (UI and performance).
Tree js module has been renamed to StructureTree.