EDIT

ref #6568 Add WS icon for WS perspective

ref #6568 Add working set perspective

ref #6672 Copy SpacerControl to avoid bundle loading errors

ref #6925 Refactor application model IDs and placeholders

ref #6568 Enhance perspective switcher

• Use icons instead of combo
• add polytomous and derivative perspective

ref #6568 Add perspective switcher

ref #6672 Migrate status line

ref #6568 Migrate taxonomic perspective

ref #6568, #6925 Switch product to pure e4

• add navigation part stack