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
2023-06-07: moved gui files to ~/local/lib/chek_mk/gui/plugins/...
2023-06-14: moved wato file to check_parameters sub directory
            removed declare_invtable_view from view definition on cmk 2.2 (see werk 15493)
            changed inventory_displayhints import (see werk 15493)
2023-06-16: changed from status_columns to inventory_columns