new features for EdgeActions:
- kill-window (kill a window when moving it to given edge)
- iconify-window (iconify a window when moving it to given edge)
- move-window-viewport (move window to the viewport in moving direction
- move-window-workspace (move window to the workspace in moving direction)
- before top and bottom edges had the same setting in SawfishConfig, this is now split
- before left and right edges had the same setting in SawfishConfig, this is now split