With programs like rofi, pressing the tab key advances to the next item
in the list. This change makes the Launcher behave in the same way,
moving the action cycling to Ctrl+Tab (and Ctrl+Shift+Tab for reverse.
- Aggregate plugins/extensions in new "all" tab
- Quick tab actions
- New tile mode for results
- Plugins can enforce/require view mode, or set preferred default
- Danksearch under "files" category
