panorama: generate settings panel on runtime
panorama: generate icon settings on the fly
panorama: do not close last tab

this would result in endless empty new dashboards
panorama: try to fix corrupted dashboards
panorama: only sync shadow on active dashboards
panorama: sync pie chart shadows on tab change
panorama: don't add drag/drop twice
panorama: delay initial shadow sync
data: save some space but keep it readable
panorama: show mask even when loading dashboards later