ref #7086, #7095 Add create/delete handler to WS navigator

ref #7095 Re-enable export button

ref #7095 Fire empty selection for multiple selected cells

ref #7095 error logging

ref #7086, #7095 Re-enable working set navigator

Merge branch 'develop' into wset

Conflicts:¶

eu.etaxonomy.taxeditor.editor/fragment.e4xmi¶

ref #7095 UI enhancements

ref #7095 Persist table state when disposing character matrix editor

ref #7095 Add persistence support for nattable state

ref #7095 Add context menu to hide/show columns and open config dialog