App: Rewritten from scratch with latest platform features.

UI: New launcher icon color that matches with light theme.

UI: Revamped themes and support syncing with system theme setting.

UI: Edge to edge display.

UI: New FAB button.

UI: New import/export screens.

UI: Toolbar content is now in dark shade on light theme.

UI: Settings now dow current values as summary.

APP: New more robust export file format.

APP: Other minor fixes and performance improvements.