Consider jstree as alternative for jquery.fancytree

Problem/Motivation

jquery.fancytree requires jquery ui and the bundle size 2x to vakata/jstree library.

Steps to reproduce

Proposed resolution

Research other libraries, namely vakata/jstree, its extensions are in par with fancytree, see: https://github.com/vakata/jstree/wiki#plugins

Remaining tasks

User interface changes

API changes

Data model changes