Partly merge e4c965: SessionInternalFrame class
Completely merge e4c965: Start new session now creates a new SessionInternalFrame
Partially merge 6ac8f8d3: New server dashboard window
Completely merge 6ac8f8d3: Integrate server dashboard with main window
add interactive components to server dashboard
Partially merge f2a6ea7: new Toolbox class
Completely merge f2a6ea7: Integrate Toolbox with main window
partial implementation of Rectangle tool