Image on lab notifications for plugins running/stopped.
UI: Icons, Keyboard shortcuts (...)

- Added Quick access items with placeholder icons.
- Added tooltips and alt keys for ribbon menu items.
- Added shortcuts:
Ctrl+N: New
Ctrl+S: Save
Ctrl+O: Open
Del: Delete selected plugin/service
Ctrl+E: Start/stop engine
Ctrl+R (or F5): Reorder graph
Alt+C: Open configuration editor
Alt+S: Create service
Apt+P: Create plugin