2016-04-08: initial release
2016-08-22: removed index column
2017-04-09: added wato enable/disable, remove columns
2018-09-04: changes for CMK 1.5.x (inv_tree --> inv_tree_list)
2020-03-15: added support for CMK1.6x
2021-07-12: rewritten for CMK 2.0
2021-07-15: added support for Catalyst 9800 Controllers